CVE-2025-54499

Name: CVE-2025-54499
Creator: NVD / NIST
Published: 2025-10-16T09:15:34.507+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.7/10EPSS 0.25%

Last modified Jun 17, 2026

CVE-2025-54499 is a low-severity vulnerability rated 3.7/10 on the CVSS scale. 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. EPSS estimates a 0.25% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1

3.7/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Probability

0.25%

15.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-208

Affected Software

Vendor	Product	Versions
Mattermost	Mattermost Server	>= 10.5.0, < 10.5.11
Mattermost	Mattermost Server	>= 10.11.0, < 10.11.3

References

https://mattermost.com/security-updatesVendor Advisory

Timeline

Published: Oct 16, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-54499?

How severe is CVE-2025-54499?

CVE-2025-54499 has a CVSS score of 3.7/10 (LOW severity). The EPSS model estimates a 0.25% probability of exploitation in the next 30 days.

How do I fix CVE-2025-54499?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-54499?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST