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The CVE-2025-XXXX vulnerability in the Mattermost Confluence Plugin (versions < 1.5.0) stems from improper authorization checks when handling subscription edits. The plugin fails to verify whether a user has legitimate access to a Confluence space before allowing modifications to its subscriptions. Attackers can exploit this flaw by sending crafted requests to the edit subscription endpoint, enabling unauthorized changes to subscriptions for restricted Confluence spaces. This oversight in access control could lead to unintended data exposure or disruption of configured integrations.
DailyCVE Form
Platform: Mattermost Confluence Plugin
Version: < 1.5.0
Vulnerability: Missing Authorization
Severity: Moderate
Date: Aug 11, 2025
Prediction: Patch by Sep 2025
What Undercode Say
Check plugin version
mmctl plugin list | grep confluence
Verify API access logs
grep "edit_subscription" /var/log/mattermost/access.log
Manual exploit test (PoC)
curl -X POST -H "Authorization: Bearer <token>" https://<mattermost>/plugins/confluence/edit_subscription -d '{"space_id":"restricted_space"}'
How Exploit
- Send unauthorized POST request to
/edit_subscription. - Manipulate `space_id` to target restricted Confluence spaces.
- Bypass access checks due to missing validation.
Protection from this CVE
- Upgrade to v1.5.0.
- Implement role-based access controls (RBAC).
- Monitor suspicious subscription changes.
Impact
- Unauthorized subscription modifications.
- Potential data leakage.
- Disruption of Confluence integrations.
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Sources:
Reported By: github.com
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