4.3

CVE-2025-12756: mattermost Incorrect Authorization

CVSS: 4.3v3.1MediumAnalyzed
AliasesGHSA-p6gj-jc38-x2m7GO-2025-4172
Published 01-12-2025Last modified 01-12-2025
Open JSON

Vulnerability summary

CVE-2025-12756 is a medium (CVSS 4.3) Incorrect Authorization vulnerability in mattermost. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.2% 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
0.18%
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-2025:4395-1

Timeline

  1. 01-12-2025
    PublishedVulnerability first disclosed.
  2. 01-12-2025
    Last modifiedVulnerability information updated.

Description

Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate user permissions when deleting comments in Boards, which allows an authenticated user with the editor role to delete comments created by other users.

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 0.18% on 18-09-2026

18-09-202618-10-2026
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/mattermost2 products
  • mattermost≥ 10.11.0, ≤ 10.11.4 | ≥ 10.12.0, ≤ 10.12.1 | ≥ 10.5.0, ≤ 10.5.12 | ≥ 11.0.0, ≤ 11.0.2 | All versions (No fix recorded) | ≥ 10.5.0+incompatible (No fix recorded) | ≥ 10.11.0+incompatible (No fix recorded) | ≥ 10.12.0+incompatible (No fix recorded)
  • mattermost-serverAll versions (No fix recorded)
Github.com/mattermost/mattermost-server2 products
  • v5All versions (No fix recorded)
  • v6All versions (No fix recorded)
Mattermost2 products
  • mattermost≥ 11.0.0, ≤ 11.0.2 | ≥ 10.12.0, ≤ 10.12.1 | ≥ 10.11.0, ≤ 10.11.4 | ≥ 10.5.0, ≤ 10.5.12
  • mattermost_server≥ 10.5.0, < 10.5.13 | ≥ 10.11.0, < 10.11.5 | ≥ 10.12.0, < 10.12.2 | ≥ 11.0.0, < 11.0.3
Github.com/mattermost/mattermost/server1 product
  • v8≤ 8.0.0-20251013062617-7977e7e6dae3 | All versions (No fix recorded)

4 vendors · 7 products

References

4 links