PT-2026-25414 · Npm · Openclaw

Published

2026-03-03

·

Updated

2026-03-03

CVSS v4.0

2.4

Low

VectorAV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Summary

The HTML session exporter (src/auto-reply/reply/export-html/template.js) interpolates img.mimeType directly into <img src="data:..."> attributes without validation or escaping. A crafted mimeType value (e.g., x" onerror="alert(1)) can break out of the attribute context and execute arbitrary JavaScript.

Impact

An attacker who can control image entries in session data (via crafted tool results or session manipulation) can achieve XSS when the exported HTML is opened. The precondition is tighter than the main XSS finding (requires image content blocks with a malicious mimeType), but exploitation is straightforward.

Affected components

  • src/auto-reply/reply/export-html/template.js — line 1032 (tool result images), line 1306 (user message images)

Reproduction

  1. Craft a session entry with an image content block where mimeType is set to image/png" onerror="alert(document.domain)
  2. Export the session to HTML
  3. Open the exported HTML — the injected onerror fires

Remediation

  • Added sanitizeImageMimeType() helper that validates mimeType against a whitelist of known image MIME types
  • Falls back to application/octet-stream for unrecognized values, preventing attribute breakout

Fix

https://github.com/openclaw/openclaw/pull/24140

Fix

XSS

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Weakness Enumeration

CWE-79

Related Identifiers

GHSA-2WW6-868G-2C56

Affected Products

Openclaw