tarteaucitron.js before 1.37.0 XSS via getElemAttr Attribute Validation Mismatch

Summary

tarteaucitron.js before 1.37.0 contains a cross-site scripting vulnerability because getElemAttr resolves 'data-' prefixed attributes while the https-only guard validates the unprefixed attribute. Attackers who can place markup, such as CMS authors, can add data-url with a javascript: URL beside a benign url to execute script in the site's origin via iframe src.

Evidence

Reported to the maintainer with a proof of concept that reproduced against the affected release.

Remediation

Upgrade tarteaucitronjs to 1.37.0 or later.

References

• VulnCheck advisoryhttps://www.vulncheck.com/advisories/tarteaucitron-js-before-1.37.0-xss-via-getelemattr-attribute-validation-mismatch
• Fix commithttps://github.com/AmauriC/tarteaucitron.js/commit/068653bd47f5d4a493251ca8e15bd2b0be9b544f
• Vulnerable codehttps://github.com/AmauriC/tarteaucitron.js/blob/v1.36.0/tarteaucitron.js#L2641-L2648
• CVE recordhttps://www.cve.org/CVERecord?id=CVE-2026-111713