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Description

Mattermost versions 10.11.x <= 10.11.6 and Mattermost GitHub plugin versions <=2.4.0 fail to validate plugin bot identity in reaction forwarding which allows attackers to hijack the GitHub reaction feature to make users add reactions to arbitrary GitHub objects via crafted notification posts.

PUBLISHED Reserved 2025-11-18 | Published 2025-12-17 | Updated 2025-12-17 | Assigner Mattermost




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

Problem types

CWE-1287: Improper Validation of Specified Type of Input

Product status

Default status
unaffected

10.11.0 (semver)
affected

11.1.0
unaffected

10.11.7
unaffected

Credits

Juho Forsén finder

References

mattermost.com/security-updates

cve.org (CVE-2025-13352)

nvd.nist.gov (CVE-2025-13352)

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Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.