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Mattermost versions 9.11.x <= 9.11.0, 9.10.x <= 9.10.1, 9.9.x <= 9.9.2 and 9.5.x <= 9.5.8 fail to properly authorize requests when viewing archived channels is disabled, which allows an attacker to retrieve post and file information about archived channels. Examples are flagged or unread posts as well as files.
Reserved 2024-09-23 | Published 2024-09-26 | Updated 2024-09-26 | Assigner MattermostCWE-284: Improper Access Control
Daniel Espino Garcia
mattermost.com/security-updates
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