7.6

CVE-2025-9072: mattermost Open Redirect

CVSS: 7.6v3.1HighAnalyzed
AliasesGHSA-69j8-prx2-vx98GO-2025-3958
Published 15-09-2025Last modified 15-09-2025
Open JSON

Vulnerability summary

CVE-2025-9072 is a high (CVSS 7.6) Open Redirect vulnerability in mattermost. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 6.8% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.6/10
010
High · 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 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 10.10.x <= 10.10.1, 10.5.x <= 10.5.9, 10.9.x <= 10.9.4 fail to validate the redirect_to parameter, allowing an attacker to craft a malicious link that, once a user authenticates with their SAML provider, could post the user’s cookies to an attacker-controlled URL.

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 0.17% on 21-09-2026

21-09-202621-10-2026
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/mattermost/mattermost-server2 products
  • v5All versions (No fix recorded)
  • v6All versions (No fix recorded)
Mattermost2 products
  • mattermost≥ 10.10.0, ≤ 10.10.1 | ≥ 10.5.0, ≤ 10.5.9 | ≥ 10.9.0, ≤ 10.9.4
  • mattermost_server≥ 10.5.0, < 10.5.10 | ≥ 10.9.0, < 10.9.5 | ≥ 10.10.0, < 10.10.2
Github.com/mattermost1 product
  • mattermost-server≥ 10.10.0, < 10.10.2 | ≥ 10.5.0, < 10.5.10 | ≥ 10.9.0, < 10.9.5 | ≥ 10.10.0+incompatible, < 10.10.2+incompatible
Github.com/mattermost/mattermost/server1 product
  • v8< 8.0.0-20250731063404-9eebaadf8f72

4 vendors · 6 products

References

7 links