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Description

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.

PUBLISHED Reserved 2025-10-15 | Published 2025-11-14 | Updated 2025-11-14 | Assigner Mattermost




MEDIUM: 5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

Problem types

CWE-306: Missing Authentication for Critical Function

Product status

Default status
unaffected

10.11.0 (semver)
affected

10.5.0 (semver)
affected

10.12.0 (semver)
affected

11.0.0
unaffected

10.11.4
unaffected

10.5.12
unaffected

10.12.1
unaffected

Credits

Juho Forsén finder

References

mattermost.com/security-updates

cve.org (CVE-2025-55073)

nvd.nist.gov (CVE-2025-55073)

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