Vulnerability · Published Oct 16, 2025 · Assigned by Mattermost
CVE-2025-54499Insecure string comparison enables timing attacks
Low 3.1
In plain English
A low-severity security flaw in Mattermost from Mattermost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)3.1Low
Exploit odds (30 days)0.3%top 79.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | 10.11.3+incompatible, 10.5.11+incompatible | GO-2025-4036 |
| Go | github.com/mattermost/mattermost-server | 10.5.11 | GHSA-xr3w-rmvj-f6m7 |
| Go | github.com/mattermost/mattermost-server | 10.11.3 | GHSA-xr3w-rmvj-f6m7 |
| Go | github.com/mattermost/mattermost-server/v5 | no fix listed | GO-2025-4036 |
| Go | github.com/mattermost/mattermost-server/v6 | no fix listed | GO-2025-4036 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250728063359-38208b8f065f | GHSA-xr3w-rmvj-f6m7 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250728063359-38208b8f065f | GO-2025-4036 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 10.5.0 – through 10.5.1010.11.0 – through 10.11.2 |
Weakness: CWE-208 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N