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CVE-2025-20051

6.5 mediumEPSS 0.6%

Medium (6.5) in mattermost mattermost server. EPSS 0.6% chance of exploitation in the next 30 days. Fixed in github.com/mattermost/mattermost/server/v8 10.2.3, 10.3.3, 10.4.2.

Mattermost versions 10.4.x <= 10.4.1, 9.11.x <= 9.11.7, 10.3.x <= 10.3.2, 10.2.x <= 10.2.2 fail to properly validate input when patching and duplicating a board, which allows a user to read any arbitrary file on the system via duplicating a specially crafted block in Boards.

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
0.6% chance of exploitation in the next 30 days; higher than 49% of CVEs (scores of 2026-10-31)
CWE
CWE-22
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-v469-7wp6-7cvpGogithub.com/mattermost/mattermost/server/v8<8.0.0-20250122165010-4ed702ccff4e8.0.0-20250122165010-4ed702ccff4e
GHSA-v469-7wp6-7cvpGogithub.com/mattermost/mattermost/server/v8>=9.11.0-rc1 <9.11.89.11.8
GHSA-v469-7wp6-7cvpGogithub.com/mattermost/mattermost/server/v8>=10.2.0-rc1 <10.2.310.2.3
GHSA-v469-7wp6-7cvpGogithub.com/mattermost/mattermost/server/v8>=10.3.0-rc1 <10.3.310.3.3
GHSA-v469-7wp6-7cvpGogithub.com/mattermost/mattermost/server/v8>=10.4.0-rc1 <10.4.210.4.2
GO-2025-3483Gogithub.com/mattermost/mattermost-server>=9.11.0-rc1+incompatible <9.11.8+incompatible
>=10.2.0-rc1+incompatible <10.2.3+incompatible
>=10.3.0-rc1+incompatible <10.3.3+incompatible
>=10.4.0-rc1+incompatible <10.4.2+incompatible		9.11.8+incompatible, 10.2.3+incompatible, 10.3.3+incompatible, 10.4.2+incompatible
GO-2025-3483Gogithub.com/mattermost/mattermost-server/v5all versionsno fix published
GO-2025-3483Gogithub.com/mattermost/mattermost-server/v6all versionsno fix published
GO-2025-3483Gogithub.com/mattermost/mattermost/server/v8<8.0.0-20250122165010-4ed702ccff4e8.0.0-20250122165010-4ed702ccff4e

References

Check your stackJSON