4.3

CVE-2025-9078: mattermost Use of Weak Hash

CVSS: 4.3v3.1MediumAnalyzed
AliasesGHSA-9p92-x77w-9fw2GO-2025-3959
Published 15-09-2025Last modified 15-09-2025
Open JSON

Vulnerability summary

CVE-2025-9078 is a medium (CVSS 4.3) Use of Weak Hash vulnerability in mattermost. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 4.2% 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
0.15%
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 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.1, 10.9.x <= 10.9.3 fail to properly validate cache keys for link metadata which allows authenticated users to access unauthorized posts and poison link previews via hash collision attacks on FNV-1 hashing

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.15%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

0.00 pp

From 0.15% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.15%

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≥ 10.8.0, ≤ 10.8.3 | ≥ 10.5.0, ≤ 10.5.8 | ≥ 9.11.0, ≤ 9.11.17 | ≥ 10.10.0, ≤ 10.10.1 | ≥ 10.9.0, ≤ 10.9.3
  • mattermost_server≥ 9.11.0, < 9.11.18 | ≥ 10.5.0, < 10.5.9 | ≥ 10.8.0, < 10.8.4 | ≥ 10.9.0, < 10.9.4 | ≥ 10.10.0, < 10.10.2
Github.com/mattermost1 product
  • mattermost-server≥ 10.8.0, < 10.8.4 | ≥ 10.5.0, < 10.5.9 | ≥ 9.11.0, < 9.11.18 | ≥ 10.10.0, < 10.10.2 | ≥ 10.9.0, < 10.9.4 | ≥ 10.10.0+incompatible, < 10.10.2+incompatible
Github.com/mattermost/mattermost/server1 product
  • v8< 8.0.0-20250718075842-cd87e5c87737

4 vendors · 6 products

References

8 links