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CVE-2025-13352

Mattermost GitHub Plugin allows unauthorized GitHub reactions via reaction forwarding hijacking

Published: Dec 17, 2025Updated: Dec 29, 2025 Sources: CVE List NVD GHSA BDUCWE-1287
3.0LOW
NVD MITRE
EPSS Score
0.2%
Top 93.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

Mattermost GitHub Plugin Bot Identity Validation Bypass Allows Arbitrary GitHub Reaction Injection

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:LUI:RS:CC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-1287

Affected Products

Go
package-ecosystem
github.com/mattermost/mattermost/server/v8
OSS Libraries
github.com/mattermost/mattermost
OSS Libraries
github.com/mattermost/mattermost-plugin-github
OSS Libraries
Mattermost
commercial·US
MattermostOn-premWeb App
Communications / messaging-chat
mattermost serverOn-premWeb App
Communications / messaging-chat
Mattermost Inc
commercial·USaka mattermost
MattermostOn-premWeb App
Communications / messaging-chat
Mattermost GitHub PluginOn-premCMS Plugin
Communications / messaging-chat

Exploitability

Official Patch Available
Is your org exposed to CVE-2025-13352?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

References

https://nvd.nist.gov/vuln/detail/CVE-2025-13352
nvd.nist.gov
https://github.com/mattermost/mattermost-plugin-github/commit/0deffcfc6bee7eaf01f7c99100e3d12e8d9df68c
github.com
https://github.com/mattermost/mattermost/commit/3b05384dd0146c1be3caa620a42e00e46027055d
github.com
and 4 more references View all →

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