CVE-2026-13203 (GCVE-0-2026-13203)
Vulnerability from cvelistv5 – Published: 2026-09-01 04:27 – Updated: 2026-09-01 12:30
VLAI
EPSS
VEX
Title
Live Composer <= 2.1.19 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'custom_id' Shortcode Attribute
Summary
The Live Composer – Free WordPress Website Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'custom_id' shortcode attribute of the dslc_modules_section and dslc_modules_area shortcodes in versions up to, and including, 2.1.19. This is due to insufficient input sanitization and output escaping on the user-supplied attribute, which is concatenated into the HTML id="" attribute of the rendered <div> element in the dslc_modules_section_front() and dslc_modules_area_front() functions without esc_attr(). This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Severity
6.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-01 12:29 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
12 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| livecomposer | Live Composer – Free WordPress Website Builder |
Affected:
0 , ≤ 2.1.19
(semver)
|
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-13203",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-01T12:29:04.335188Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-09-01T12:30:18.721Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Live Composer \u2013 Free WordPress Website Builder",
"vendor": "livecomposer",
"versions": [
{
"lessThanOrEqual": "2.1.19",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Osvaldo Noe Gonzalez Del Rio (Os)"
}
],
"descriptions": [
{
"lang": "en",
"value": "The Live Composer \u2013 Free WordPress Website Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the \u0027custom_id\u0027 shortcode attribute of the dslc_modules_section and dslc_modules_area shortcodes in versions up to, and including, 2.1.19. This is due to insufficient input sanitization and output escaping on the user-supplied attribute, which is concatenated into the HTML id=\"\" attribute of the rendered \u003cdiv\u003e element in the dslc_modules_section_front() and dslc_modules_area_front() functions without esc_attr(). This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 6.4,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-79",
"description": "CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-01T04:27:51.709Z",
"orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
"shortName": "Wordfence"
},
"references": [
{
"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/9b9e0302-b981-4885-822f-063247bec4b2?source=cve"
},
{
"url": "https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.17/includes/display-functions.php#L1888"
},
{
"url": "https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.17/includes/display-functions.php#L1922"
},
{
"url": "https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.17/includes/display-functions.php#L2107"
},
{
"url": "https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.17/includes/display-functions.php#L2113"
},
{
"url": "https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.17/includes/display-functions.php#L1882"
},
{
"url": "https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.13/includes/display-functions.php#L1888"
},
{
"url": "https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.13/includes/display-functions.php#L1922"
},
{
"url": "https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.13/includes/display-functions.php#L2107"
},
{
"url": "https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.13/includes/display-functions.php#L2113"
},
{
"url": "https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.13/includes/display-functions.php#L1882"
},
{
"url": "https://plugins.trac.wordpress.org/changeset?reponame=\u0026old=3662813%40live-composer-page-builder\u0026new=3662813%40live-composer-page-builder"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-06-24T14:21:42.000Z",
"value": "Vendor Notified"
},
{
"lang": "en",
"time": "2026-08-31T15:53:35.000Z",
"value": "Disclosed"
}
],
"title": "Live Composer \u003c= 2.1.19 - Authenticated (Contributor+) Stored Cross-Site Scripting via \u0027custom_id\u0027 Shortcode Attribute"
}
},
"cveMetadata": {
"assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
"assignerShortName": "Wordfence",
"cveId": "CVE-2026-13203",
"datePublished": "2026-09-01T04:27:51.709Z",
"dateReserved": "2026-06-24T14:06:30.279Z",
"dateUpdated": "2026-09-01T12:30:18.721Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-13203",
"date": "2026-09-01",
"epss": "0.00241",
"percentile": "0.15098"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-13203\",\"sourceIdentifier\":\"security@wordfence.com\",\"published\":\"2026-09-01T05:17:08.713\",\"lastModified\":\"2026-09-01T20:47:54.130\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"The Live Composer \u2013 Free WordPress Website Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the \u0027custom_id\u0027 shortcode attribute of the dslc_modules_section and dslc_modules_area shortcodes in versions up to, and including, 2.1.19. This is due to insufficient input sanitization and output escaping on the user-supplied attribute, which is concatenated into the HTML id=\\\"\\\" attribute of the rendered \u003cdiv\u003e element in the dslc_modules_section_front() and dslc_modules_area_front() functions without esc_attr(). This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.\"}],\"affected\":[{\"source\":\"security@wordfence.com\",\"affectedData\":[{\"vendor\":\"livecomposer\",\"product\":\"Live Composer \u2013 Free WordPress Website Builder\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"0\",\"lessThanOrEqual\":\"2.1.19\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security@wordfence.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N\",\"baseScore\":6.4,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.1,\"impactScore\":2.7}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-09-01T12:29:04.335188Z\",\"id\":\"CVE-2026-13203\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"security@wordfence.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-79\"}]}],\"references\":[{\"url\":\"https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.13/includes/display-functions.php#L1882\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.13/includes/display-functions.php#L1888\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.13/includes/display-functions.php#L1922\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.13/includes/display-functions.php#L2107\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.13/includes/display-functions.php#L2113\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.17/includes/display-functions.php#L1882\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.17/includes/display-functions.php#L1888\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.17/includes/display-functions.php#L1922\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.17/includes/display-functions.php#L2107\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.17/includes/display-functions.php#L2113\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/changeset?reponame=\u0026old=3662813%40live-composer-page-builder\u0026new=3662813%40live-composer-page-builder\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://www.wordfence.com/threat-intel/vulnerabilities/id/9b9e0302-b981-4885-822f-063247bec4b2?source=cve\",\"source\":\"security@wordfence.com\"}]}}"
}
}
Loading…
Loading…
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.
Loading…
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.
Loading…
Loading…