7.5

CVE-2025-55070: mattermost

CVSS: 7.5v3.1HighAnalyzed
AliasesGHSA-xpg8-8xpv-948pGO-2025-4128
Published 14-11-2025Last modified 14-11-2025
Open JSON

Vulnerability summary

CVE-2025-55070 is a high (CVSS 7.5) vulnerability in mattermost. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 23% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.32%
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 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 <11 fail to enforce multi-factor authentication on WebSocket connections which allows unauthenticated users to access sensitive information via WebSocket events

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.32%

Chance of exploitation in the next 30 days

Percentile

23%

Versus all other CVEs

30-day change

+0.02 pp

From 0.29% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.32%

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
Github.com/mattermost1 product
  • mattermost-server< 11.1.0 | < 11.1.0+incompatible
Github.com/mattermost/mattermost/server1 product
  • v8< 8.0.0-20250912063506-7d8b7b5e4a60

4 vendors · 6 products

References

5 links