The vulnerability (CVE-2025-XXXX) in Mattermost arises due to improper authorization checks when processing posts via the Wrangler plugin. When both the AI and Wrangler plugins are enabled, an attacker can bypass access controls by crafting a post with the `activate_ai` override property. This allows unauthorized users to trigger AI-generated responses despite lacking permissions. The flaw affects Mattermost versions 10.5.0 to 10.5.1, 10.4.0 to 10.4.3, and 9.11.0 to 9.11.9. Patched versions (10.5.2, 10.4.4, 9.11.10) enforce proper validation to prevent this exploit.
DailyCVE Form:
Platform: Mattermost
Version: 10.5.0-10.5.1
Vulnerability: Incorrect Authorization
Severity: Low
Date: Apr 16, 2025
What Undercode Say:
Exploitation:
- Attacker crafts a post with `activate_ai` property via Wrangler.
2. Exploit triggers AI response without permissions.
3. Bypasses authorization checks in vulnerable versions.
Detection:
curl -X GET http://<mattermost-server>/api/v4/config | grep "Version"
Mitigation:
- Upgrade to patched versions (10.5.2, 10.4.4, or 9.11.10).
2. Disable Wrangler plugin if unused.
3. Audit logs for unexpected AI activations:
SELECT FROM Posts WHERE Props LIKE '%activate_ai%';
Patch Analysis:
The fix adds validation in `post_utils.js`:
if (post.props.activate_ai && !userHasAIAccess()) {
throw new Error("Unauthorized AI access");
}
Workaround:
Add custom policy to restrict Wrangler posts:
Sample policy.py
def validate_post(post):
if 'activate_ai' in post.props:
require_permission('ai_bot_access')
References:
- GitHub Advisory
- NVD Entry
Impact: Low risk due to required plugin configuration and limited exploit scope.
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
