5.4

CVE-2025-55073: mattermost

CVSS: 5.4v3.1MediumAnalyzed
AliasesGHSA-ff85-qw3h-g9vpGO-2025-4129
Published 14-11-2025Last modified 14-11-2025
Open JSON

Vulnerability summary

CVE-2025-55073 is a medium (CVSS 5.4) vulnerability in mattermost. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 8.7% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.4/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.20%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

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

Timeline

  1. 14-11-2025
    PublishedVulnerability first disclosed.
  2. 14-11-2025
    Last modifiedVulnerability information updated.

Description

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.20%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

+0.01 pp

From 0.18% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.20%

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≥ 10.11.0, ≤ 10.11.3 | ≥ 10.5.0, ≤ 10.5.11 | 10.12.0
  • mattermost_server≥ 10.5.0, < 10.5.12 | ≥ 10.11.0, < 10.11.4 | ≥ 10.12.0, < 10.12.1
Github.com/mattermost1 product
  • mattermost-server≥ 10.11.0, < 10.11.4 | ≥ 10.5.0, < 10.5.12 | ≥ 10.12.0, < 10.12.1 | ≥ 10.12.0+incompatible, < 10.12.1+incompatible
Github.com/mattermost/mattermost/server1 product
  • v8< 8.0.0-20250929212932-a41db04d2746

4 vendors · 6 products

References

9 links