Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-66421

CVE-2026-66421HIGH

tugcantopaloglu openclaw-dashboard — OpenClaw Dashboard Stored XSS via lastMessage Session Field

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   P   N   P   H   H   N    8.8   .0063   48.5     —

AFFECTED
  Product             Versions  Fixed
  openclaw-dashboard  1.1.0 –   —

TIMELINE
  Jul 27  Reserved by VulnCheck
  Jul 30  Published (CNA: VulnCheck)
  Sep 3   EXPLOIT PUBLISHED — CVE-2026-66421 (tugcantopaloglu openclaw-dashboard). Public exploit reference added.

CWE-79 · CNA: VulnCheck · CVSS v4.0 · 3 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 27, 2026	Reserved	Reserved by VulnCheck
July 30, 2026	Published	Published (CNA: VulnCheck)
September 3, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-66421 (tugcantopaloglu openclaw-dashboard). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
tugcantopaloglu	openclaw-dashboard	—	1.1.0	—

Weaknesses

CWE-79

References (3)

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

Authoritative record: CVE-2026-66421 at cve.org

Vendors: tugcantopaloglu

Weaknesses: CWE-79

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-66421 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.