cve.bz

CVE-2025-6226

6.5 mediumEPSS 0.4%

Medium (6.5) in mattermost mattermost server. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in github.com/mattermost/mattermost-server 10.5.7, 10.5.7+incompatible, 10.7.4.

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.

Severity

CVSS 3.1

6.5 medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS
0.4% chance of exploitation in the next 30 days; higher than 31% of CVEs (scores of 2026-10-31)
CWE
CWE-306
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-7h34-9chr-58qhGogithub.com/mattermost/mattermost-server>=10.5.0 <10.5.710.5.7
GHSA-7h34-9chr-58qhGogithub.com/mattermost/mattermost-server>=10.8.0 <10.8.210.8.2
GHSA-7h34-9chr-58qhGogithub.com/mattermost/mattermost-server>=10.7.0 <10.7.410.7.4
GHSA-7h34-9chr-58qhGogithub.com/mattermost/mattermost-server>=9.11.0 <9.11.179.11.17
GHSA-7h34-9chr-58qhGogithub.com/mattermost/mattermost/server/v8<8.0.0-20250520130510-fa40a8c5d47f8.0.0-20250520130510-fa40a8c5d47f
GO-2025-3819Gogithub.com/mattermost/mattermost-server>=9.11.0+incompatible <9.11.17+incompatible
>=10.5.0+incompatible <10.5.7+incompatible
>=10.7.0+incompatible <10.7.4+incompatible
>=10.8.0+incompatible <10.8.2+incompatible		9.11.17+incompatible, 10.5.7+incompatible, 10.7.4+incompatible, 10.8.2+incompatible
GO-2025-3819Gogithub.com/mattermost/mattermost-server/v5all versionsno fix published
GO-2025-3819Gogithub.com/mattermost/mattermost-server/v6all versionsno fix published
GO-2025-3819Gogithub.com/mattermost/mattermost/server/v8<8.0.0-20250520130510-fa40a8c5d47f8.0.0-20250520130510-fa40a8c5d47f

References

Check your stackJSON