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CVE-2026-66421

OpenClaw Dashboard Stored XSS via lastMessage Session Field

CVSS 4.0 8.8 HIGHCVSS 3.1 9.3 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-66421

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-66421

Published

openclaw-dashboard

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "tugcantopaloglu",
                    "product": "openclaw-dashboard",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "1.1.0",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "affected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON