CVE-2025-54499
Mattermost has an Observable Timing Discrepancy vulnerability
Record from NVD · Published September 17, 2025
github.com/mattermost/mattermost-server is fixed in 10.11.3 and 10.5.11 (Go Modules)
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 0.27% · 19.5th percentile
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| github.com/mattermost/mattermost-server | Go Modules | 10.11.3, 10.5.11 |
| github.com/mattermost/mattermost/server/v8 | Go Modules | 8.0.0-20250728063359-38208b8f065f |
| mattermost_server | mattermost | 10.11.3, 10.5.11 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| mattermost | mattermost_server | 10.5.0, 10.11.0 |
Timeline
- Sep 17, 2025 CVE Published
- Oct 16, 2025 EPSS Score (30 in total, the first dated here)
- Oct 16, 2025 Coalition ESS Score (8 in total, the first dated here)
- Mar 17, 2026 Security Advisory
- Jun 17, 2026 CVE Updated
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2025-54499
vulnetix vdb fixes CVE-2025-54499Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2025-54499/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart