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CVE-2026-16049

_GitLab Plugin allows cross-channel post injection and phishing via missing channel permission checks in issue API endpoints_ PUBLISHED

Description (CNA)

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

Affected (CNA)

Vendor / productVersions
Mattermost / Mattermostaffected 0 through 10.20.11; affected 0 through 11.5.7; unaffected 11.9.0; unaffected 10.11.21; unaffected 11.7.6

CWE

CWE-862

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.