CVE-2026-53427 (GCVE-0-2026-53427)
Vulnerability from cvelistv5 – Published: 2026-06-29 18:50 – Updated: 2026-06-30 04:37
VLAI
Title
Cross-site scripting in MDEx via unescaped highlight_lines_class code-fence attribute
Summary
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in leandrocp MDEx allows stored or reflected cross-site scripting via attacker-controlled Markdown.
When syntax highlighting and full info-string forwarding (render: [full_info_string: true]) are enabled, the Lumis adapter copies the value of a code fence's highlight_lines_class info-string attribute, unescaped, into the class attribute of every rendered line. comrak_nif::lumis_adapter::LumisAdapter::parse_custom_attributes in native/comrak_nif/src/lumis_adapter.rs shlex-parses the info string and stores each key=value pair verbatim, highlight_lines_config pulls highlight_lines_class into the per-line class value, and write_highlighted interpolates that value directly into the class attribute of the per-line <div>. A single-quoted shell token preserves an inner double quote through shlex parsing, so a value such as '"><script>alert(1)</script>' terminates the class attribute early and the markup that follows is emitted as live HTML.
An attacker who can submit Markdown (through comments, posts, wiki pages, documentation, or any user-generated content) can inject arbitrary HTML and JavaScript that runs in the browser of every user who views the rendered output, enabling session theft, account takeover, and other client-side attacks. No authentication or special privileges are required.
The vulnerable native code originally shipped inside mdex (in native/comrak_nif/src/lumis_adapter.rs) and was later extracted into the separate mdex_native package (native/mdex_native_nif/src/lumis_adapter.rs), where it remains unpatched.
This issue affects mdex from 0.11.3 before 0.12.3, and mdex_native from 0.1.0 before 0.2.3.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/leandrocp/mdex_native/security… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-53427.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-53427 | related |
| https://github.com/leandrocp/mdex_native/commit/7… | patch |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| leandrocp | mdex |
Affected:
0.11.3 , < 0.12.3
(semver)
cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:* |
|
| leandrocp | mdex |
Affected:
0d7ffc84ea742e1daf666426814e5bb6d0499433 , < 6ed94d905f97af188323f042698ae841c02293b4
(git)
cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:* |
|
| leandrocp | mdex_native |
Affected:
0.1.0 , < 0.2.3
(semver)
cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:* |
|
| leandrocp | mdex_native |
Affected:
956528c5e31746253347029e810a969ab916fd27 , < 798a363b4339f6f7162ec8437c4c9f9b5ae6fbf3
(git)
cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:* |
Credits
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"value": "\u003cp\u003eThe vulnerable code path is only reachable when MDEx is configured with a syntax-highlighting formatter (for example \u003ctt\u003esyntax_highlight: [formatter: {:html_inline, ...}]\u003c/tt\u003e or \u003ctt\u003e{:html_linked, ...}\u003c/tt\u003e) and with full info-string forwarding enabled (\u003ctt\u003erender: [full_info_string: true]\u003c/tt\u003e). Full info-string forwarding is required for comrak to hand the \u003ctt\u003ehighlight_lines_class\u003c/tt\u003e attribute to the highlighter, so any application that uses the line-highlighting attributes already has it enabled.\u003c/p\u003e"
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A single-quoted shell token preserves an inner double quote through shlex parsing, so a value such as \u0027\\\"\u003e\u003cscript\u003ealert(1)\u003c/script\u003e\u0027 terminates the class attribute early and the markup that follows is emitted as live HTML.\\n\\nAn attacker who can submit Markdown (through comments, posts, wiki pages, documentation, or any user-generated content) can inject arbitrary HTML and JavaScript that runs in the browser of every user who views the rendered output, enabling session theft, account takeover, and other client-side attacks. No authentication or special privileges are required.\\n\\nThe vulnerable native code originally shipped inside mdex (in native/comrak_nif/src/lumis_adapter.rs) and was later extracted into the separate mdex_native package (native/mdex_native_nif/src/lumis_adapter.rs), where it remains unpatched.\\n\\nThis issue affects mdex from 0.11.3 before 0.12.3, and mdex_native from 0.1.0 before 0.2.3.\"}],\"affected\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"affectedData\":[{\"vendor\":\"leandrocp\",\"product\":\"mdex\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://repo.hex.pm\",\"packageName\":\"mdex\",\"cpes\":[\"cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*\"],\"modules\":[\"\u0027Elixir.MDEx\u0027\",\"comrak_nif\"],\"programFiles\":[\"native/comrak_nif/src/lumis_adapter.rs\"],\"programRoutines\":[{\"name\":\"comrak_nif::lumis_adapter::LumisAdapter::parse_custom_attributes\"},{\"name\":\"comrak_nif::lumis_adapter::LumisAdapter::highlight_lines_config\"},{\"name\":\"comrak_nif::lumis_adapter::LumisAdapter::write_highlighted\"},{\"name\":\"\u0027Elixir.MDEx\u0027:to_html/2\"}],\"repo\":\"https://github.com/leandrocp/mdex\",\"packageURL\":\"pkg:hex/mdex\",\"versions\":[{\"version\":\"0.11.3\",\"lessThan\":\"0.12.3\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"leandrocp\",\"product\":\"mdex\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://github.com\",\"packageName\":\"leandrocp/mdex\",\"cpes\":[\"cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*\"],\"modules\":[\"\u0027Elixir.MDEx\u0027\",\"comrak_nif\"],\"programFiles\":[\"native/comrak_nif/src/lumis_adapter.rs\"],\"programRoutines\":[{\"name\":\"comrak_nif::lumis_adapter::LumisAdapter::parse_custom_attributes\"},{\"name\":\"comrak_nif::lumis_adapter::LumisAdapter::highlight_lines_config\"},{\"name\":\"comrak_nif::lumis_adapter::LumisAdapter::write_highlighted\"},{\"name\":\"\u0027Elixir.MDEx\u0027:to_html/2\"}],\"repo\":\"https://github.com/leandrocp/mdex\",\"packageURL\":\"pkg:github/leandrocp/mdex\",\"versions\":[{\"version\":\"0d7ffc84ea742e1daf666426814e5bb6d0499433\",\"lessThan\":\"6ed94d905f97af188323f042698ae841c02293b4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"leandrocp\",\"product\":\"mdex_native\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://repo.hex.pm\",\"packageName\":\"mdex_native\",\"cpes\":[\"cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:*\"],\"modules\":[\"\u0027Elixir.MDExNative.Comrak\u0027\",\"mdex_native_nif\"],\"programFiles\":[\"native/mdex_native_nif/src/lumis_adapter.rs\"],\"programRoutines\":[{\"name\":\"mdex_native_nif::lumis_adapter::LumisAdapter::parse_custom_attributes\"},{\"name\":\"mdex_native_nif::lumis_adapter::LumisAdapter::highlight_lines_config\"},{\"name\":\"mdex_native_nif::lumis_adapter::LumisAdapter::write_highlighted\"},{\"name\":\"\u0027Elixir.MDExNative.Native\u0027:document_to_html_with_options/2\"},{\"name\":\"\u0027Elixir.MDExNative.Comrak\u0027:document_to_html/2\"}],\"repo\":\"https://github.com/leandrocp/mdex_native\",\"packageURL\":\"pkg:hex/mdex_native\",\"versions\":[{\"version\":\"0.1.0\",\"lessThan\":\"0.2.3\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"leandrocp\",\"product\":\"mdex_native\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://github.com\",\"packageName\":\"leandrocp/mdex_native\",\"cpes\":[\"cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:*\"],\"modules\":[\"\u0027Elixir.MDExNative.Comrak\u0027\",\"mdex_native_nif\"],\"programFiles\":[\"native/mdex_native_nif/src/lumis_adapter.rs\"],\"programRoutines\":[{\"name\":\"mdex_native_nif::lumis_adapter::LumisAdapter::parse_custom_attributes\"},{\"name\":\"mdex_native_nif::lumis_adapter::LumisAdapter::highlight_lines_config\"},{\"name\":\"mdex_native_nif::lumis_adapter::LumisAdapter::write_highlighted\"},{\"name\":\"\u0027Elixir.MDExNative.Native\u0027:document_to_html_with_options/2\"},{\"name\":\"\u0027Elixir.MDExNative.Comrak\u0027:document_to_html/2\"}],\"repo\":\"https://github.com/leandrocp/mdex_native\",\"packageURL\":\"pkg:github/leandrocp/mdex_native\",\"versions\":[{\"version\":\"956528c5e31746253347029e810a969ab916fd27\",\"lessThan\":\"798a363b4339f6f7162ec8437c4c9f9b5ae6fbf3\",\"versionType\":\"git\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X\",\"baseScore\":2.3,\"baseSeverity\":\"LOW\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"PRESENT\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"PASSIVE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"NONE\",\"subConfidentialityImpact\":\"LOW\",\"subIntegrityImpact\":\"LOW\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-06-29T19:18:13.166991Z\",\"id\":\"CVE-2026-53427\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-79\"}]}],\"references\":[{\"url\":\"https://cna.erlef.org/cves/CVE-2026-53427.html\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/leandrocp/mdex_native/commit/798a363b4339f6f7162ec8437c4c9f9b5ae6fbf3\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/leandrocp/mdex_native/security/advisories/GHSA-v664-pmxr-mxxx\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://osv.dev/vulnerability/EEF-CVE-2026-53427\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"}]}}",
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-53427\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-29T19:18:13.166991Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-29T19:19:09.581Z\"}}], \"cna\": {\"title\": \"Cross-site scripting in MDEx via unescaped highlight_lines_class code-fence attribute\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Peter Ullrich\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Leandro Pereira\"}, {\"lang\": \"en\", \"type\": \"analyst\", \"value\": \"Jonatan M\\u00e4nnchen / EEF\"}], \"impacts\": [{\"capecId\": \"CAPEC-63\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-63 Cross-Site Scripting (XSS)\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 2.3, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"LOW\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N\", \"userInteraction\": \"PASSIVE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"LOW\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"LOW\", \"vulnConfidentialityImpact\": \"NONE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/leandrocp/mdex\", \"vendor\": \"leandrocp\", \"modules\": [\"\u0027Elixir.MDEx\u0027\", \"comrak_nif\"], \"product\": \"mdex\", \"versions\": [{\"status\": \"affected\", \"version\": \"0.11.3\", \"lessThan\": \"0.12.3\", \"versionType\": \"semver\"}], \"packageURL\": \"pkg:hex/mdex\", \"packageName\": \"mdex\", \"programFiles\": [\"native/comrak_nif/src/lumis_adapter.rs\"], \"collectionURL\": \"https://repo.hex.pm\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"comrak_nif::lumis_adapter::LumisAdapter::parse_custom_attributes\"}, {\"name\": \"comrak_nif::lumis_adapter::LumisAdapter::highlight_lines_config\"}, {\"name\": \"comrak_nif::lumis_adapter::LumisAdapter::write_highlighted\"}, {\"name\": \"\u0027Elixir.MDEx\u0027:to_html/2\"}]}, {\"cpes\": [\"cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/leandrocp/mdex\", \"vendor\": \"leandrocp\", \"modules\": [\"\u0027Elixir.MDEx\u0027\", \"comrak_nif\"], \"product\": \"mdex\", \"versions\": [{\"status\": \"affected\", \"version\": \"0d7ffc84ea742e1daf666426814e5bb6d0499433\", \"lessThan\": \"6ed94d905f97af188323f042698ae841c02293b4\", \"versionType\": \"git\"}], \"packageURL\": \"pkg:github/leandrocp/mdex\", \"packageName\": \"leandrocp/mdex\", \"programFiles\": [\"native/comrak_nif/src/lumis_adapter.rs\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"comrak_nif::lumis_adapter::LumisAdapter::parse_custom_attributes\"}, {\"name\": \"comrak_nif::lumis_adapter::LumisAdapter::highlight_lines_config\"}, {\"name\": \"comrak_nif::lumis_adapter::LumisAdapter::write_highlighted\"}, {\"name\": \"\u0027Elixir.MDEx\u0027:to_html/2\"}]}, {\"cpes\": [\"cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/leandrocp/mdex_native\", \"vendor\": \"leandrocp\", \"modules\": [\"\u0027Elixir.MDExNative.Comrak\u0027\", \"mdex_native_nif\"], \"product\": \"mdex_native\", \"versions\": [{\"status\": \"affected\", \"version\": \"0.1.0\", \"lessThan\": \"0.2.3\", \"versionType\": \"semver\"}], \"packageURL\": \"pkg:hex/mdex_native\", \"packageName\": \"mdex_native\", \"programFiles\": [\"native/mdex_native_nif/src/lumis_adapter.rs\"], \"collectionURL\": \"https://repo.hex.pm\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"mdex_native_nif::lumis_adapter::LumisAdapter::parse_custom_attributes\"}, {\"name\": \"mdex_native_nif::lumis_adapter::LumisAdapter::highlight_lines_config\"}, {\"name\": \"mdex_native_nif::lumis_adapter::LumisAdapter::write_highlighted\"}, {\"name\": \"\u0027Elixir.MDExNative.Native\u0027:document_to_html_with_options/2\"}, {\"name\": \"\u0027Elixir.MDExNative.Comrak\u0027:document_to_html/2\"}]}, {\"cpes\": [\"cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/leandrocp/mdex_native\", \"vendor\": \"leandrocp\", \"modules\": [\"\u0027Elixir.MDExNative.Comrak\u0027\", \"mdex_native_nif\"], \"product\": \"mdex_native\", \"versions\": [{\"status\": \"affected\", \"version\": \"956528c5e31746253347029e810a969ab916fd27\", \"lessThan\": \"798a363b4339f6f7162ec8437c4c9f9b5ae6fbf3\", \"versionType\": \"git\"}], \"packageURL\": \"pkg:github/leandrocp/mdex_native\", \"packageName\": \"leandrocp/mdex_native\", \"programFiles\": [\"native/mdex_native_nif/src/lumis_adapter.rs\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"mdex_native_nif::lumis_adapter::LumisAdapter::parse_custom_attributes\"}, {\"name\": \"mdex_native_nif::lumis_adapter::LumisAdapter::highlight_lines_config\"}, {\"name\": \"mdex_native_nif::lumis_adapter::LumisAdapter::write_highlighted\"}, {\"name\": \"\u0027Elixir.MDExNative.Native\u0027:document_to_html_with_options/2\"}, {\"name\": \"\u0027Elixir.MDExNative.Comrak\u0027:document_to_html/2\"}]}], \"references\": [{\"url\": \"https://github.com/leandrocp/mdex_native/security/advisories/GHSA-v664-pmxr-mxxx\", \"tags\": [\"vendor-advisory\", \"related\"]}, {\"url\": \"https://cna.erlef.org/cves/CVE-2026-53427.html\", \"tags\": [\"related\"]}, {\"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-53427\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/leandrocp/mdex_native/commit/798a363b4339f6f7162ec8437c4c9f9b5ae6fbf3\", \"tags\": [\"patch\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"Do not enable full info-string forwarding (render: [full_info_string: true]) when rendering untrusted Markdown, which prevents the highlight_lines_class attribute from reaching the highlighter. Alternatively, restrict highlight_lines_class values to a safe character set (for example [A-Za-z0-9_- ]) before rendering.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eDo not enable full info-string forwarding (\u003ctt\u003erender: [full_info_string: true]\u003c/tt\u003e) when rendering untrusted Markdown, which prevents the \u003ctt\u003ehighlight_lines_class\u003c/tt\u003e attribute from reaching the highlighter. Alternatively, restrict \u003ctt\u003ehighlight_lines_class\u003c/tt\u003e values to a safe character set (for example \u003ctt\u003e[A-Za-z0-9_- ]\u003c/tt\u003e) before rendering.\u003c/p\u003e\", \"base64\": false}]}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027) vulnerability in leandrocp MDEx allows stored or reflected cross-site scripting via attacker-controlled Markdown.\\n\\nWhen syntax highlighting and full info-string forwarding (render: [full_info_string: true]) are enabled, the Lumis adapter copies the value of a code fence\u0027s highlight_lines_class info-string attribute, unescaped, into the class attribute of every rendered line. comrak_nif::lumis_adapter::LumisAdapter::parse_custom_attributes in native/comrak_nif/src/lumis_adapter.rs shlex-parses the info string and stores each key=value pair verbatim, highlight_lines_config pulls highlight_lines_class into the per-line class value, and write_highlighted interpolates that value directly into the class attribute of the per-line \u003cdiv\u003e. A single-quoted shell token preserves an inner double quote through shlex parsing, so a value such as \u0027\\\"\u003e\u003cscript\u003ealert(1)\u003c/script\u003e\u0027 terminates the class attribute early and the markup that follows is emitted as live HTML.\\n\\nAn attacker who can submit Markdown (through comments, posts, wiki pages, documentation, or any user-generated content) can inject arbitrary HTML and JavaScript that runs in the browser of every user who views the rendered output, enabling session theft, account takeover, and other client-side attacks. No authentication or special privileges are required.\\n\\nThe vulnerable native code originally shipped inside mdex (in native/comrak_nif/src/lumis_adapter.rs) and was later extracted into the separate mdex_native package (native/mdex_native_nif/src/lumis_adapter.rs), where it remains unpatched.\\n\\nThis issue affects mdex from 0.11.3 before 0.12.3, and mdex_native from 0.1.0 before 0.2.3.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eImproper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027) vulnerability in leandrocp MDEx allows stored or reflected cross-site scripting via attacker-controlled Markdown.\u003c/p\u003e\u003cp\u003eWhen syntax highlighting and full info-string forwarding (\u003ctt\u003erender: [full_info_string: true]\u003c/tt\u003e) are enabled, the Lumis adapter copies the value of a code fence\u0027s \u003ctt\u003ehighlight_lines_class\u003c/tt\u003e info-string attribute, unescaped, into the \u003ctt\u003eclass\u003c/tt\u003e attribute of every rendered line. \u003ctt\u003ecomrak_nif::lumis_adapter::LumisAdapter::parse_custom_attributes\u003c/tt\u003e in \u003ctt\u003enative/comrak_nif/src/lumis_adapter.rs\u003c/tt\u003e shlex-parses the info string and stores each \u003ctt\u003ekey=value\u003c/tt\u003e pair verbatim, \u003ctt\u003ehighlight_lines_config\u003c/tt\u003e pulls \u003ctt\u003ehighlight_lines_class\u003c/tt\u003e into the per-line class value, and \u003ctt\u003ewrite_highlighted\u003c/tt\u003e interpolates that value directly into the \u003ctt\u003eclass\u003c/tt\u003e attribute of the per-line \u003ctt\u003e\u0026lt;div\u0026gt;\u003c/tt\u003e. A single-quoted shell token preserves an inner double quote through shlex parsing, so a value such as \u003ctt\u003e\u0027\u0026quot;\u0026gt;\u0026lt;script\u0026gt;alert(1)\u0026lt;/script\u0026gt;\u0027\u003c/tt\u003e terminates the \u003ctt\u003eclass\u003c/tt\u003e attribute early and the markup that follows is emitted as live HTML.\u003c/p\u003e\u003cp\u003eAn attacker who can submit Markdown (through comments, posts, wiki pages, documentation, or any user-generated content) can inject arbitrary HTML and JavaScript that runs in the browser of every user who views the rendered output, enabling session theft, account takeover, and other client-side attacks. No authentication or special privileges are required.\u003c/p\u003e\u003cp\u003eThe vulnerable native code originally shipped inside \u003ctt\u003emdex\u003c/tt\u003e (in \u003ctt\u003enative/comrak_nif/src/lumis_adapter.rs\u003c/tt\u003e) and was later extracted into the separate \u003ctt\u003emdex_native\u003c/tt\u003e package (\u003ctt\u003enative/mdex_native_nif/src/lumis_adapter.rs\u003c/tt\u003e), where it remains unpatched.\u003c/p\u003e\u003cp\u003eThis issue affects mdex from 0.11.3 before 0.12.3, and mdex_native from 0.1.0 before 0.2.3.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-79\", \"description\": \"CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"The vulnerable code path is only reachable when MDEx is configured with a syntax-highlighting formatter (for example syntax_highlight: [formatter: {:html_inline, ...}] or {:html_linked, ...}) and with full info-string forwarding enabled (render: [full_info_string: true]). Full info-string forwarding is required for comrak to hand the highlight_lines_class attribute to the highlighter, so any application that uses the line-highlighting attributes already has it enabled.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eThe vulnerable code path is only reachable when MDEx is configured with a syntax-highlighting formatter (for example \u003ctt\u003esyntax_highlight: [formatter: {:html_inline, ...}]\u003c/tt\u003e or \u003ctt\u003e{:html_linked, ...}\u003c/tt\u003e) and with full info-string forwarding enabled (\u003ctt\u003erender: [full_info_string: true]\u003c/tt\u003e). Full info-string forwarding is required for comrak to hand the \u003ctt\u003ehighlight_lines_class\u003c/tt\u003e attribute to the highlighter, so any application that uses the line-highlighting attributes already has it enabled.\u003c/p\u003e\", \"base64\": false}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"0.12.3\", \"versionStartIncluding\": \"0.11.3\"}], \"operator\": \"AND\"}, {\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"0.2.3\", \"versionStartIncluding\": \"0.1.0\"}], \"operator\": \"AND\"}], \"operator\": \"OR\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-06-30T04:37:51.902Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-53427\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-30T04:37:51.902Z\", \"dateReserved\": \"2026-06-09T11:01:47.529Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-06-29T18:50:17.185Z\", \"assignerShortName\": \"EEF\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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