Vulnerability Database

328,409

Total vulnerabilities in the database

OpenClaw has stored XSS in exported session HTML viewer via markdown/raw-HTML rendering

Summary

The exported session HTML viewer allowed stored XSS when untrusted session content included raw HTML markdown tokens or unescaped metadata fields.

Impact

Opening a crafted exported HTML session could execute attacker-controlled JavaScript in the viewer context. This can expose session content in the page and enable phishing or UI spoofing in the trusted export view.

Affected Packages / Versions

  • Package: openclaw (npm)
  • Affected versions: <= 2026.2.22-2
  • Patched version (released): >= 2026.2.23

Technical Details

The exporter rendered markdown with marked.parse(...) and inserted HTML via innerHTML, but did not override the html renderer token path. Raw HTML (for example <img ... onerror=...>) was passed through. Additional tree/header metadata fields were interpolated without escaping in the export template.

Reproduction

  1. Create a session containing content like <img src=x onerror=alert(1)>.
  2. Export the session to HTML.
  3. Open the exported file.
  4. Observe script execution from injected content.

Remediation

  • Added a marked html(token) renderer override that escapes raw HTML tokens.
  • Escaped previously unescaped tree/header metadata fields in the export template.
  • Added image MIME sanitization for exported data-URL image rendering.
  • Added regression tests for markdown/token and metadata escaping paths.

Fix Commit(s)

  • f8524ec77a3999d573e6c6b8a5055bf35c49a2e6

Release Process Note

patched_versions is pre-set to the released version (>= 2026.2.23). This advisory now reflects released fix version 2026.2.23.

OpenClaw thanks @allsmog for reporting.

No technical information available.

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