CVE-2026-66421 PUBLISHED

OpenClaw Dashboard Stored XSS via lastMessage Session Field

Assigner: VulnCheck
Reserved: 27.07.2026 Published: 30.07.2026 Updated: 31.07.2026

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.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
CVSS Score: 8.8

Product Status

Vendor tugcantopaloglu
Product openclaw-dashboard
Versions Default: affected
  • Version 1.1.0 is affected

Credits

  • Theodosis Paidakis reporter

References

Problem Types

  • Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') CWE