EUVD-2026-60440Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
PR:L chosen because CMS content submission typically requires authenticated editor access; all other metrics match stored XSS with cross-browser scope change.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
3DescriptionCVE.org
ApostropheCMS is an open-source Node.js content management system. Prior to 2.17.6, sanitizeHtml() can pass disallowed executable markup through packages/sanitize-html/index.js when textarea or xmp is included in allowedTags because a literal solidus after the raw-text end-tag name is treated as text by htmlparser2 and the ontext handler emits that content without escaping, while a browser parses the following img onerror markup as active HTML. This issue is fixed in version 2.17.6.
AnalysisAI
Stored cross-site scripting in ApostropheCMS prior to 2.17.6 enables execution of arbitrary JavaScript in victim browsers through a parser-differential bypass in the bundled sanitize-html library. When textarea or xmp is included in a site's allowedTags configuration, a payload using a trailing solidus on the closing tag - such as </textarea/> - is treated as text by htmlparser2 10.x but as a valid close by spec-compliant browsers, causing injected markup like <img onerror=...> to execute as live HTML on page load. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two concurrent conditions: the target ApostropheCMS deployment must have `textarea` or `xmp` explicitly included in the `allowedTags` option of its `sanitizeHtml()` invocation (a non-default, operator-chosen configuration), and the attacker must have the ability to submit HTML content processed by that sanitizer - in practice, CMS content-authoring or commenting access. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 6.1 (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) correctly reflects the network delivery vector and cross-browser scope change characteristic of stored XSS, but the real-world exposed population is substantially narrower than the score alone implies: exploitation requires the site administrator to have explicitly added `textarea` or `xmp` to the `allowedTags` sanitization configuration, which is not the default. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade the `apostrophe` npm package to version 2.17.6 or later, the fix confirmed in commit eae1fb2b72ec5d1c27d0977509c6482a0408f725 and documented at https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-jxwj-j7wr-gfrw and https://github.com/apostrophecms/apostrophe/pull/5501. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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