EUVD-2026-69654
GHSA-g8qq-57p8-ggw5
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
AC:H reflects the non-default SVG animation configuration required to trigger the flaw; all other metrics align with the vendor-assigned vector.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
4Blast Radius
ecosystem impact- 2 npm packages depend on sanitize-html (2 direct, 0 indirect)
Ecosystem-wide dependent count for version 1.9.0.
DescriptionCVE.org
ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. From version 1.9.0 until version 2.17.7, packages/sanitize-html/index.js validates an animation value attribute as one flat URL and does not recognize that attributeName selecting href or xlink:href gives the sibling values, from, to, or by attribute SVG SMIL URL semantics. In configurations that allow the animate, animateColor, animateMotion, animateTransform, or set elements, a values list can begin with a safe fragment and contain a later executable destination that survives allowedSchemesAppliedToAttributes checking. When the sanitized SVG is rendered, the browser can copy that later destination into the live link, and a victim who activates the link can execute script in the application's origin. This issue is fixed in version 2.17.7.
AnalysisAI
Stored XSS in sanitize-html versions 1.9.0 through 2.17.6 allows authenticated low-privileged users to inject executable JavaScript via SVG SMIL animation elements that survive the library's scheme-policy sanitization. The sanitizer validates the values attribute as a single flat URL, missing that attributeName="href" gives values URI-list semantics under SVG SMIL; a payload of #safe;javascript:alert(1) passes the scheme check on its leading fragment while the javascript: entry survives intact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires three concurrent conditions: (1) `sanitize-html` must be configured with at least one SVG animation element (`animate`, `animateColor`, `animateMotion`, `animateTransform`, or `set`) in `allowedTags` - this is explicitly a non-default, opt-in setting; (2) the attacker must have access to submit or store HTML/SVG content that is processed by the misconfigured sanitizer (CVSS PR:L - an authenticated low-privilege user such as a CMS editor or contributor); (3) a victim must click or activate the sanitized SVG link in a browser (CVSS UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 3.1 score is 5.4 (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N). … 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 `sanitize-html` to version 2.17.7 or later, which rejects `attributeName` values targeting `href` or `xlink:href` on SVG `animate` and `set` elements, preventing URI-list bypass. … Detailed patch versions, workarounds, and compensating controls in full report. |
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