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Mattermost versions 8.1.x before 8.1.9, 9.2.x before 9.2.5, and 9.3.0 fail to sanitize the metadata on posts containing permalinks under specific conditions, which allows an authenticated attacker to access the contents of individual posts in channels they are not a member of.
Reserved 2024-02-27 | Published 2024-02-29 | Updated 2024-08-12 | Assigner MattermostCWE-284: Improper Access Control
Juho Nurminen
mattermost.com/security-updates
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