MEDIUM 6.4 Go
Mattermost doesn't validate channel ownership of an existing subscription before applying edits
GHSA-mxq2-5jpg-7474 · CVE-2026-6062
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Description
Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 Fail to validate channel ownership of an existing subscription before applying edits which allows an authenticated attacker to hijack subscriptions from channels they have no access to via a crafted PUT request to the subscription edit endpoint.. Mattermost Advisory ID: MMSA-2026-00650
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