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GHSA-2ww6-868g-2c56

MediumCVSS 4.6 / 10
Published Mar 3, 2026·Last modified Mar 30, 2026
Affected Components(0)

No affected components available

Description

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

Risk Scores
Base Score
4.6

The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. The attacker needs the user to perform some action, like clicking a link. The vulnerability can affect other systems as well, not just the initial system. There is a low impact on the confidentiality of the information. There is a low impact on the integrity of the data.

Threat Intelligence
4.2

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.15%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Medium severity
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