OpenClaw Dashboard Stored XSS via lastMessage Session Field (CVE-2026-66421) | HOL Guard CVE

High · CVSS 8.8CVE-2026-66421

OpenClaw Dashboard Stored XSS via lastMessage Session Field

Answer in brief

CVE-2026-66421 records a High severity (CVSS 8.8) vulnerability in OpenClaw Dashboard Stored XSS via lastMessage Session Field. The current sources do not mark it as known exploited. The current feed maps tugcantopaloglu/openclaw-dashboard (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 30, 2026Updated Sep 24, 2026Source checked Sep 24, 2026First seen by HOL Sep 9, 2026Material review Sep 24, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps tugcantopaloglu/openclaw-dashboard (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:a:tugcantopaloglu:openclaw_agent_dashboard::::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
tugcantopaloglu/openclaw-dashboardgeneric	*	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for tugcantopaloglu/openclaw-dashboard.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Jul 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 9, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.