6.1

CVE-2025-9084: mattermost Open Redirect

CVSS: 6.1v3.1MediumAnalyzed
AliasesGHSA-hm95-jx66-g2ghGO-2025-3960
Published 15-09-2025Last modified 15-09-2025
Open JSON

Vulnerability summary

CVE-2025-9084 is a medium (CVSS 6.1) Open Redirect vulnerability in mattermost. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.3% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (NVD)
EPSS score
0.17%
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 3 · Related 3
OPENSUSE-SU-2025:15564-1OPENSUSE-SU-2026:21483-1SUSE-SU-2025:03289-1

Timeline

  1. 15-09-2025
    PublishedVulnerability first disclosed.
  2. 15-09-2025
    Last modifiedVulnerability information updated.

Description

Mattermost versions 10.5.x <= 10.5.9 fail to properly validate redirect URLs which allows attackers to redirect users to malicious sites via crafted OAuth login URLs

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

0.00 pp

From 0.17% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.17%

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≥ 10.5.0, < 10.5.10 | ≥ 10.5.0+incompatible, < 10.5.10+incompatible
Github.com/mattermost/mattermost/server1 product
  • v8< 8.0.0-202508080704-39bd251fe4f600 | All versions (No fix recorded)

4 vendors · 6 products

References

5 links