Medium severity4.3NVD Advisory· Published Aug 17, 2026· Updated Aug 17, 2026
CVE-2026-16049
CVE-2026-16049
Description
Mattermost Plugins versions <=11.8 10.20.11 11.5.7.0 _The Mattermost GitLab plugin fails to verify channel permissions when processing API requests with a caller-supplied_ {{post_id}}_, and fails to validate the_ {{web_url}} _parameter against the configured GitLab instance, which allows an authenticated attacker to inject bot-authored messages containing arbitrary URLs into channels they do not have access to via the_ {{createIssue}} _and_ {{attachCommentToIssue}} _API endpoints._ Mattermost Advisory ID: MMSA-2026-00673
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- Range: <=11.8 10.20.11, 11.5.7.0
- Range: <=11.8 10.20.11, 11.5.7.0
Patches
Vulnerability mechanics
References
1News mentions
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