4.3

CVE-2025-14350: mattermost Missing Authorization

CVSS: 4.3v3.1MediumAnalyzed
AliasesGHSA-57cc-2pf4-mhmxGO-2026-4521
Published 16-02-2026Last modified 17-02-2026
Open JSON

Vulnerability summary

CVE-2025-14350 is a medium (CVSS 4.3) Missing Authorization vulnerability in mattermost. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.1% 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 · +0.02 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. 16-02-2026
    PublishedVulnerability first disclosed.
  2. 17-02-2026
    Last modifiedVulnerability information updated.

Description

Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate team membership when processing channel mentions which allows authenticated users to determine the existence of teams and their URL names via posting channel shortlinks and observing the channel_mentions property in the API response. Mattermost Advisory ID: MMSA-2025-00563

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

8%

Versus all other CVEs

30-day change

+0.02 pp

From 0.17% on 21-09-2026

21-09-202621-10-2026
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
  • mattermost≥ 11.1.0, ≤ 11.1.2 | ≥ 10.11.0, ≤ 10.11.9 | ≥ 11.2.0, ≤ 11.2.1
  • mattermost_server≥ 10.11.0, < 10.11.10 | ≥ 11.1.0, < 11.1.3 | ≥ 11.2.0, < 11.2.2
Github.com/mattermost1 product
  • mattermost-server≥ 11.1.0 (No fix recorded) | ≥ 10.11.0 (No fix recorded) | ≥ 11.2.0 (No fix recorded) | < 5.3.2-0.20251209134645-761e56bb11cc | All versions (No fix recorded) | ≥ 10.11.0+incompatible (No fix recorded) | ≥ 11.1.0+incompatible (No fix recorded) | ≥ 11.2.0+incompatible (No fix recorded)
Github.com/mattermost/mattermost/server1 product
  • v8< 8.0.0-20251209134645-761e56bb11cc

4 vendors · 6 products

References

5 links