CVE-2026-64941 (GCVE-0-2026-64941)
Vulnerability from cvelistv5 – Published: 2026-08-10 11:05 – Updated: 2026-08-10 13:00
VLAI
EPSS
VEX
Title
Open redirect in Phoenix.LiveView.validate_local_url!/2 via ASCII tab, LF and CR
Summary
URL Redirection to Untrusted Site ('Open Redirect') vulnerability in phoenixframework phoenix_live_view allows an attacker to send a victim's browser to an origin of the attacker's choosing via a :to value containing ASCII tab, LF or CR.
redirect/2 validates :to through the private validate_local_url!/2 in lib/phoenix_live_view.ex, which is intended to guarantee the target is a path within the application. It rejects a leading // and any backslash, but not ASCII tab, LF or CR. Browsers strip those three characters before parsing a URL, so a value such as /<TAB>/example.com passes validation as a path and is then resolved as the scheme-relative URL //example.com. The live navigation functions share the guard but are not affected, because the client expands their target against the current origin. push_patch/2 is also affected before 0.7.0, which is when that expansion was added.
This issue affects phoenix_live_view: from 0.5.0 before 1.0.19, from 1.1.0-rc.0 before 1.1.33, and from 1.2.0-rc.0 before 1.2.9.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-10 13:00 UTC
CWE
- CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| phoenixframework | phoenix_live_view |
Affected:
0.5.0 , < 1.0.19
(semver)
Affected: 1.1.0-rc.0 , < 1.1.33 (semver) Affected: 1.2.0-rc.0 , < 1.2.9 (semver) cpe:2.3:a:phoenixframework:phoenix_live_view:*:*:*:*:*:*:*:* |
|
| phoenixframework | phoenix_live_view |
Affected:
b20dba3f65a380b2e4868dae03397f13d2daa070 , < *
(git)
cpe:2.3:a:phoenixframework:phoenix_live_view:*:*:*:*:*:*:*:* |
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Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-601\"}]}],\"references\":[{\"url\":\"https://cna.erlef.org/cves/CVE-2026-64941.html\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/phoenixframework/phoenix_live_view/commit/0b8c733133466912f81adecaea72b6712370242e\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/phoenixframework/phoenix_live_view/commit/1c164f83df0bb922dfff9c60d125da5b0cfd6619\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/phoenixframework/phoenix_live_view/commit/2068b304d71907064b159b6bc60c5ad85a876ecf\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/phoenixframework/phoenix_live_view/security/advisories/GHSA-36m4-rm57-3prf\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://osv.dev/vulnerability/EEF-CVE-2026-64941\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/phoenixframework/phoenix_live_view/security/advisories/GHSA-36m4-rm57-3prf\",\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\"}]}}",
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-64941\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-10T13:00:10.932600Z\"}}}], \"references\": [{\"url\": \"https://github.com/phoenixframework/phoenix_live_view/security/advisories/GHSA-36m4-rm57-3prf\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-10T13:00:29.061Z\"}}], \"cna\": {\"title\": \"Open redirect in Phoenix.LiveView.validate_local_url!/2 via ASCII tab, LF and CR\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Eurico Nicacio\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Steffen Deusch\"}, {\"lang\": \"en\", \"type\": \"remediation reviewer\", \"value\": \"Jos\\u00e9 Valim\"}, {\"lang\": \"en\", \"type\": \"analyst\", \"value\": \"Jonatan M\\u00e4nnchen / EEF\"}], \"impacts\": [{\"capecId\": \"CAPEC-3\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-3 Using Leading \u0027Ghost\u0027 Character Sequences to Bypass Input Filters\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 2.1, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"LOW\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"ACTIVE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"LOW\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"LOW\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:phoenixframework:phoenix_live_view:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/phoenixframework/phoenix_live_view\", \"vendor\": \"phoenixframework\", \"modules\": [\"\u0027Elixir.Phoenix.LiveView\u0027\"], \"product\": \"phoenix_live_view\", \"versions\": [{\"status\": \"affected\", \"version\": \"0.5.0\", \"lessThan\": \"1.0.19\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.1.0-rc.0\", \"lessThan\": \"1.1.33\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.2.0-rc.0\", \"lessThan\": \"1.2.9\", \"versionType\": \"semver\"}], \"packageURL\": \"pkg:hex/phoenix_live_view\", \"packageName\": \"phoenix_live_view\", \"programFiles\": [\"lib/phoenix_live_view.ex\"], \"collectionURL\": \"https://repo.hex.pm\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"\u0027Elixir.Phoenix.LiveView\u0027:redirect/2\"}, {\"name\": \"\u0027Elixir.Phoenix.LiveView\u0027:push_patch/2\"}]}, {\"cpes\": [\"cpe:2.3:a:phoenixframework:phoenix_live_view:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/phoenixframework/phoenix_live_view\", \"vendor\": \"phoenixframework\", \"modules\": [\"\u0027Elixir.Phoenix.LiveView\u0027\"], \"product\": \"phoenix_live_view\", \"versions\": [{\"status\": \"affected\", \"changes\": [{\"at\": \"0b8c733133466912f81adecaea72b6712370242e\", \"status\": \"unaffected\"}, {\"at\": \"1c164f83df0bb922dfff9c60d125da5b0cfd6619\", \"status\": \"unaffected\"}, {\"at\": \"2068b304d71907064b159b6bc60c5ad85a876ecf\", \"status\": \"unaffected\"}], \"version\": \"b20dba3f65a380b2e4868dae03397f13d2daa070\", \"lessThan\": \"*\", \"versionType\": \"git\"}], \"packageURL\": \"pkg:github/phoenixframework/phoenix_live_view\", \"packageName\": \"phoenixframework/phoenix_live_view\", \"programFiles\": [\"lib/phoenix_live_view.ex\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"\u0027Elixir.Phoenix.LiveView\u0027:redirect/2\"}, {\"name\": \"\u0027Elixir.Phoenix.LiveView\u0027:push_patch/2\"}]}], \"references\": [{\"url\": \"https://github.com/phoenixframework/phoenix_live_view/security/advisories/GHSA-36m4-rm57-3prf\", \"tags\": [\"vendor-advisory\", \"related\"]}, {\"url\": \"https://cna.erlef.org/cves/CVE-2026-64941.html\", \"tags\": [\"related\"]}, {\"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-64941\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/phoenixframework/phoenix_live_view/commit/0b8c733133466912f81adecaea72b6712370242e\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/phoenixframework/phoenix_live_view/commit/1c164f83df0bb922dfff9c60d125da5b0cfd6619\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/phoenixframework/phoenix_live_view/commit/2068b304d71907064b159b6bc60c5ad85a876ecf\", \"tags\": [\"patch\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"Reject any untrusted value containing ASCII tab, LF or CR before passing it as :to to redirect/2, or to push_patch/2 before 0.7.0. Alternatively, map client-supplied navigation targets to a fixed set of known-good paths rather than forwarding the value.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eReject any untrusted value containing ASCII tab, LF or CR before passing it as \u003ccode\u003e:to\u003c/code\u003e to \u003ccode\u003eredirect/2\u003c/code\u003e, or to \u003ccode\u003epush_patch/2\u003c/code\u003e before 0.7.0. Alternatively, map client-supplied navigation targets to a fixed set of known-good paths rather than forwarding the value.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"Reject any untrusted value containing ASCII tab, LF or CR before passing it as `:to` to `redirect/2`, or to `push_patch/2` before 0.7.0. Alternatively, map client-supplied navigation targets to a fixed set of known-good paths rather than forwarding the value.\", \"base64\": false}]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"URL Redirection to Untrusted Site (\u0027Open Redirect\u0027) vulnerability in phoenixframework phoenix_live_view allows an attacker to send a victim\u0027s browser to an origin of the attacker\u0027s choosing via a :to value containing ASCII tab, LF or CR.\\n\\nredirect/2 validates :to through the private validate_local_url!/2 in lib/phoenix_live_view.ex, which is intended to guarantee the target is a path within the application. It rejects a leading // and any backslash, but not ASCII tab, LF or CR. Browsers strip those three characters before parsing a URL, so a value such as /\u003cTAB\u003e/example.com passes validation as a path and is then resolved as the scheme-relative URL //example.com. The live navigation functions share the guard but are not affected, because the client expands their target against the current origin. push_patch/2 is also affected before 0.7.0, which is when that expansion was added.\\n\\nThis issue affects phoenix_live_view: from 0.5.0 before 1.0.19, from 1.1.0-rc.0 before 1.1.33, and from 1.2.0-rc.0 before 1.2.9.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eURL Redirection to Untrusted Site (\u0027Open Redirect\u0027) vulnerability in phoenixframework phoenix_live_view allows an attacker to send a victim\u0027s browser to an origin of the attacker\u0027s choosing via a \u003ccode\u003e:to\u003c/code\u003e value containing ASCII tab, LF or CR.\u003c/p\u003e\\n\u003cp\u003e\u003ccode\u003eredirect/2\u003c/code\u003e validates \u003ccode\u003e:to\u003c/code\u003e through the private \u003ccode\u003evalidate_local_url!/2\u003c/code\u003e in \u003ccode\u003elib/phoenix_live_view.ex\u003c/code\u003e, which is intended to guarantee the target is a path within the application. It rejects a leading \u003ccode\u003e//\u003c/code\u003e and any backslash, but not ASCII tab, LF or CR. Browsers strip those three characters before parsing a URL, so a value such as \u003ccode\u003e/\u0026lt;TAB\u0026gt;/example.com\u003c/code\u003e passes validation as a path and is then resolved as the scheme-relative URL \u003ccode\u003e//example.com\u003c/code\u003e. The live navigation functions share the guard but are not affected, because the client expands their target against the current origin. \u003ccode\u003epush_patch/2\u003c/code\u003e is also affected before 0.7.0, which is when that expansion was added.\u003c/p\u003e\\n\u003cp\u003eThis issue affects phoenix_live_view: from 0.5.0 before 1.0.19, from 1.1.0-rc.0 before 1.1.33, and from 1.2.0-rc.0 before 1.2.9.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"URL Redirection to Untrusted Site (\u0027Open Redirect\u0027) vulnerability in phoenixframework phoenix_live_view allows an attacker to send a victim\u0027s browser to an origin of the attacker\u0027s choosing via a `:to` value containing ASCII tab, LF or CR.\\n\\n`redirect/2` validates `:to` through the private `validate_local_url!/2` in `lib/phoenix_live_view.ex`, which is intended to guarantee the target is a path within the application. It rejects a leading `//` and any backslash, but not ASCII tab, LF or CR. Browsers strip those three characters before parsing a URL, so a value such as `/\u003cTAB\u003e/example.com` passes validation as a path and is then resolved as the scheme-relative URL `//example.com`. The live navigation functions share the guard but are not affected, because the client expands their target against the current origin. `push_patch/2` is also affected before 0.7.0, which is when that expansion was added.\\n\\nThis issue affects phoenix_live_view: from 0.5.0 before 1.0.19, from 1.1.0-rc.0 before 1.1.33, and from 1.2.0-rc.0 before 1.2.9.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-601\", \"description\": \"CWE-601 URL Redirection to Untrusted Site (\u0027Open Redirect\u0027)\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"The application must pass an externally influenced value as :to to redirect/2, or to push_patch/2 before 0.7.0, for example a return_to parameter carried through sign-in or a navigation target taken from a handle_event/3 payload.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eThe application must pass an externally influenced value as \u003ccode\u003e:to\u003c/code\u003e to \u003ccode\u003eredirect/2\u003c/code\u003e, or to \u003ccode\u003epush_patch/2\u003c/code\u003e before 0.7.0, for example a \u003ccode\u003ereturn_to\u003c/code\u003e parameter carried through sign-in or a navigation target taken from a \u003ccode\u003ehandle_event/3\u003c/code\u003e payload.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"The application must pass an externally influenced value as `:to` to `redirect/2`, or to `push_patch/2` before 0.7.0, for example a `return_to` parameter carried through sign-in or a navigation target taken from a `handle_event/3` payload.\", \"base64\": false}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:phoenixframework:phoenix_live_view:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.0.19\", \"versionStartIncluding\": \"0.5.0\"}, {\"criteria\": \"cpe:2.3:a:phoenixframework:phoenix_live_view:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.1.33\", \"versionStartIncluding\": \"1.1.0-rc.0\"}, {\"criteria\": \"cpe:2.3:a:phoenixframework:phoenix_live_view:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.2.9\", \"versionStartIncluding\": \"1.2.0-rc.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-08-10T11:05:14.571Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-64941\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-10T13:00:33.543Z\", \"dateReserved\": \"2026-08-09T16:30:01.572Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-08-10T11:05:14.571Z\", \"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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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