3.7

CVE-2025-54499: mattermost Observable Timing Discrepancy

CVSS: 3.7v3.1LowAnalyzed
AliasesGHSA-xr3w-rmvj-f6m7GO-2025-4036
Published 16-10-2025Last modified 16-10-2025
Open JSON

Vulnerability summary

CVE-2025-54499 is a low (CVSS 3.7) Observable Timing Discrepancy vulnerability in mattermost. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 18.4% of scored vulnerabilities.

Overall risk
15/100
0100
Low · default modelHow is this calculated?
CVSS score
3.7/10
010
Low · v3.1 (NVD)
EPSS score
0.27%
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 2 · Related 2
OPENSUSE-SU-2025:15710-1OPENSUSE-SU-2026:21483-1

Timeline

  1. 16-10-2025
    PublishedVulnerability first disclosed.
  2. 16-10-2025
    Last modifiedVulnerability information updated.

Description

Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to use constant-time comparison for sensitive string comparisons which allows attackers to exploit timing oracles to perform byte-by-byte brute force attacks via response time analysis on Cloud API keys and OAuth client secrets

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.27%

Chance of exploitation in the next 30 days

Percentile

18%

Versus all other CVEs

30-day change

0.00 pp

From 0.27% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.27%

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, < 10.5.11 | ≥ 10.11.0, < 10.11.3 | ≥ 10.11.0+incompatible, < 10.11.3+incompatible
Github.com/mattermost/mattermost/server1 product
  • v8< 8.0.0-20250728063359-38208b8f065f

4 vendors · 6 products

References

6 links