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CVE-2025-13352: mattermost

CVSS: 3.0v3.1LowAnalyzed
AliasesGHSA-jf5h-xfw4-p8gpGO-2025-4247
Published 17-12-2025Last modified 17-12-2025
Open JSON

Vulnerability summary

CVE-2025-13352 is a low (CVSS 3.0) vulnerability in mattermost. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 6.5% of scored vulnerabilities.

Overall risk
12/100
0100
Low · default modelHow is this calculated?
CVSS score
3.0/10
010
Low · v3.1 (CVE.org)
EPSS score
0.18%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2026:21483-1SUSE-SU-2026:0037-1

Timeline

  1. 17-12-2025
    PublishedVulnerability first disclosed.
  2. 17-12-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

0.00 pp

From 0.17% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.18%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Github.com/mattermost3 products
  • 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
  • mattermost-plugin-github< 1.0.1-0.20250829075715-0deffcfc6bee
  • mattermost-server≥ 10.11.0-rc1+incompatible (No fix recorded)
Github.com/mattermost/mattermost-server2 products
  • v5All versions (No fix recorded)
  • v6All versions (No fix recorded)
Mattermost2 products
Github.com/mattermost/mattermost/server1 product
  • v8≥ 10.11.0-rc1, < 10.11.7-0.20251106103514-3b05384dd014 | All versions (No fix recorded)

4 vendors · 8 products

References

6 links