XSS in Tugcantopaloglu Openclaw Agent Dashboard
CVE-2026-66421
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.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.005 (43.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N.
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- disclosure@vulncheck.com (Product, product)
- disclosure@vulncheck.com (Exploit, vendor-advisory, Third Party Advisory, Mitigation)
- disclosure@vulncheck.com (Exploit, Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-66421?
- CVE-2026-66421 is a critical-severity vulnerability in Tugcantopaloglu Openclaw Agent Dashboard, classified under Cross-site Scripting. CVSS score: 9.3/10. Published 2026-07-30.
- How severe is CVE-2026-66421?
- Critical severity. CVSS v3 base score is 9.3 out of 10.
- Is CVE-2026-66421 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.