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Description

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to enforce access permissions on the Agents plugin which allows other users to determine when users had read channels via channel member objects

PUBLISHED Reserved 2025-10-15 | Published 2025-11-18 | Updated 2025-11-18 | Assigner Mattermost




LOW: 3.0CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N

Problem types

CWE-1426: Improper Validation of Generative AI Output

Product status

Default status
unaffected

10.11.0 (semver)
affected

10.5.0 (semver)
affected

11.0.0
unaffected

10.11.4
unaffected

10.5.12
unaffected

Credits

Juho Forsén finder

References

mattermost.com/security-updates

cve.org (CVE-2025-55074)

nvd.nist.gov (CVE-2025-55074)

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