CVE-2026-66421

CRITICAL 9.3

OpenClaw Dashboard Stored XSS via lastMessage Session Field

CVSS Score

9.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	tugcantopaloglu
Product	openclaw-dashboard
Published	Jul 30, 2026

Stay Ahead of the Next One

Get instant alerts for tugcantopaloglu openclaw-dashboard

Be the first to know when new critical vulnerabilities affecting tugcantopaloglu openclaw-dashboard are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

tugcantopaloglu / openclaw-dashboard

1.1.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/tugcantopaloglu/openclaw-dashboard github.com: https://github.com/theopaid/Stored-Cross-Site-Scripting-Via-Agent-Messages-Leading-To-Session-Token-Theft-openclaw-dashboard- vulncheck.com: https://www.vulncheck.com/advisories/openclaw-dashboard-stored-xss-via-lastmessage-session-field

Credits

🔍 Theodosis Paidakis