Headline
GHSA-xr3w-rmvj-f6m7: Mattermost has an Observable Timing Discrepancy vulnerability
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.
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- GitHub Advisory Database
- GitHub Reviewed
- CVE-2025-54499
Mattermost has an Observable Timing Discrepancy vulnerability
Low severity GitHub Reviewed Published Oct 16, 2025 to the GitHub Advisory Database • Updated Oct 16, 2025
Package
gomod github.com/mattermost/mattermost-server (Go)
Affected versions
>= 10.5.0, < 10.5.11
>= 10.11.0, < 10.11.3
Patched versions
10.5.11
10.11.3
gomod github.com/mattermost/mattermost/server/v8 (Go)
< 8.0.0-20250728063359-38208b8f065f
8.0.0-20250728063359-38208b8f065f
Description
Published to the GitHub Advisory Database
Oct 16, 2025
Last updated
Oct 16, 2025
EPSS score