Vulnerability Description
OpenClaw Dashboard contains a stored cross-site scripting vulnerability that allows unauthenticated remote attackers to execute arbitrary JavaScript in the administrator's browser session by injecting HTML markup into agent transcript messages processed through the sessions API. Attackers can craft a message containing inline event handler payloads such as an img tag with an onerror attribute within the 60-character rendering budget, which is stored in the session transcript and interpolated unsanitized into innerHTML on the default landing page, allowing theft of session tokens and unauthorized calls to authenticated administrative endpoints including agent instruction file modification.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/theopaid/Stored-Cross-Site-Scripting-Via-Agent-Messages-Leadi
- https://github.com/tugcantopaloglu/openclaw-dashboard
- https://www.vulncheck.com/advisories/openclaw-dashboard-stored-xss-via-lastmessa
- https://github.com/theopaid/Stored-Cross-Site-Scripting-Via-Agent-Messages-Leadi
FAQ
What is CVE-2026-66421?
CVE-2026-66421 is a vulnerability with a CVSS score of 9.3 (CRITICAL). OpenClaw Dashboard contains a stored cross-site scripting vulnerability that allows unauthenticated remote attackers to execute arbitrary JavaScript in the administrator's browser session by injecting...
How severe is CVE-2026-66421?
CVE-2026-66421 has been rated CRITICAL with a CVSS base score of 9.3/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-66421?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.