CVE-2025-6226

Description

Mattermost versions 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 fail to verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user to read posts in private channels they don't have access to via guessing the PendingPostID of recently created posts.

Reserved 2025-06-18 | Published 2025-07-18 | Updated 2025-07-18 | Assigner Mattermost

Problem types

CWE-306: Missing Authentication for Critical Function

Product status

Default status
unaffected

10.5.0
affected

10.8.0
affected

10.7.0
affected

9.11.0
affected

10.9.0
unaffected

10.5.7
unaffected

10.8.2
unaffected

10.7.4
unaffected

9.11.17
unaffected

Credits

Dawid Kulikowski (daw10) finder

References

mattermost.com/security-updates

cve.org (CVE-2025-6226)

nvd.nist.gov (CVE-2025-6226)

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