4.3

CVE-2025-13767: mattermost Incorrect Authorization

CVSS: 4.3v3.1MediumAnalyzed
AliasesGHSA-fmqf-pmcm-8cx9GO-2025-4259
Published 24-12-2025Last modified 24-12-2025
Open JSON

Vulnerability summary

CVE-2025-13767 is a medium (CVSS 4.3) Incorrect Authorization vulnerability in mattermost. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.5% of scored vulnerabilities.

Overall risk
17/100
0100
Low · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.19%
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-2026:0757-1

Timeline

  1. 24-12-2025
    PublishedVulnerability first disclosed.
  2. 24-12-2025
    Last modifiedVulnerability information updated.

Description

Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fails to validate user channel membership when attaching Mattermost posts as comments to Jira issues, which allows an authenticated attacker with access to the Jira plugin to read post content and attachments from channels they do not have access to.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

0.00 pp

From 0.19% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.19%

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/mattermost/mattermost-server2 products
  • v5All versions (No fix recorded)
  • v6All versions (No fix recorded)
Mattermost2 products
  • mattermost11.1.0 | ≥ 11.0.0, ≤ 11.0.5 | ≥ 10.12.0, ≤ 10.12.3 | ≥ 10.11.0, ≤ 10.11.7
  • mattermost_server≥ 10.11.0, < 10.11.8 | ≥ 10.12.0, < 10.12.4 | ≥ 11.0.0, < 11.0.6 | ≥ 11.1.0, < 11.1.1
Github.com/mattermost1 product
  • mattermost-server≥ 10.11.0, < 10.11.8 | ≥ 10.12.0, < 10.12.4 | ≥ 11.0.0, < 11.0.6 | ≥ 11.1.0, < 11.1.1 | ≥ 11.1.0+incompatible, < 11.1.1+incompatible
Github.com/mattermost/mattermost/server1 product
  • v8< 8.0.0-20251121122154-b57c297c6d7 | All versions (No fix recorded)

4 vendors · 6 products

References

7 links