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Fencer Vulns
low 3.0

CVE-2025-13352 json

Mattermost GitHub Plugin allows unauthorized GitHub reactions via reaction forwarding hijacking

published 2025-12-17 10 mo ago modified 2026-10-13 26 d ago also GHSA-jf5h-xfw4-p8gp , GO-2025-4247 , EUVD-2025-203891

cvss
3.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 6%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/mattermost/mattermost/server/v8 10.11.7-0.20251106103514-3b05384dd014
  • go github.com/mattermost/mattermost 10.11.7-0.20251106103514-3b05384dd014, 11.1.0, 11.1.0+incompatible
  • go github.com/mattermost/mattermost-plugin-github 1.0.1-0.20250829075715-0deffcfc6bee
  • Mattermost Mattermost 10.11.7, 11.1.0
  • govulncheck-vulndb openSUSE Leap 15.6 0.0.20251230T014957-150000.1.134.1

suse advisories SUSE-SU-2026:0037-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
10 mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 3.0 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:L/A:N
GitHub 3.1 3.0 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
go github.com/mattermost/mattermost/server/v8
>=10.11.0-rc1, <10.11.7-0.20251106103514-3b05384dd014
all versions
10.11.7-0.20251106103514-3b05384dd014
go github.com/mattermost/mattermost
<10.11.7-0.20251106103514-3b05384dd014
>=11.0.0-alpha.1, <11.1.0
>=11.0.0-alpha.1+incompatible, <11.1.0+incompatible
10.11.7-0.20251106103514-3b05384dd014
11.1.0
11.1.0+incompatible
go github.com/mattermost/mattermost-plugin-github
<1.0.1-0.20250829075715-0deffcfc6bee
1.0.1-0.20250829075715-0deffcfc6bee
go github.com/mattermost/mattermost-server
>=10.11.0-rc1+incompatible
 no fix listed
go github.com/mattermost/mattermost-server/v5
all versions
 no fix listed
go github.com/mattermost/mattermost-server/v6
all versions
 no fix listed

Affected products

  • Mattermost Mattermost

Classification

Weakness
  • CWE-1287 Improper Validation of Specified Type of Input

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.