CVE-2025-54499 json
Insecure string comparison enables timing attacks
published 2025-10-16 12 mo ago modified 2026-10-19 21 d ago also GHSA-xr3w-rmvj-f6m7 , GO-2025-4036 , EUVD-2025-34730
- cvss
- 3.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 20%
- public exploits
- 0
- none known
Summary
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
Patch / fix
- go github.com/mattermost/mattermost/server/v8 8.0.0-20250728063359-38208b8f065f
- go github.com/mattermost/mattermost-server 10.5.11, 10.5.11+incompatible, 10.11.3, 10.11.3+incompatible
- Mattermost Mattermost 10.5.11, 10.11.3, 10.12.0
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
- govulncheck-vulndb openSUSE Tumbleweed 0.0.20251105T184115-1.1
opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2025:15710-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 12 mo ago
Exploit prediction
0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 3.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N |
| NVD | 3.1 | 3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N |
| GitHub | 3.1 | 3.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost/server/v8 | <8.0.0-20250728063359-38208b8f065f |
8.0.0-20250728063359-38208b8f065f |
| go | github.com/mattermost/mattermost-server | >=10.5.0, <10.5.11 >=10.11.0, <10.11.3 >=10.5.0+incompatible, <10.5.11+incompatible >=10.11.0+incompatible, <10.11.3+incompatible |
10.5.11 10.11.3 10.5.11+incompatible 10.11.3+incompatible |
| go | github.com/mattermost/mattermost-server/v5 | all versions |
no fix listed |
| go | github.com/mattermost/mattermost-server/v6 | all versions |
no fix listed |
Affected products
- Mattermost Mattermost
Classification
- Weakness
-
- CWE-208 Observable Timing Discrepancy
References
-
github.com
/mattermost/mattermost/commit/38208b8f065f0786eac0e968f9d754b91b62878c
web
-
github.com
/mattermost/mattermost/commit/97a4c7839cf5610cfe17c52042878aebb7678372
web
-
mattermost.com
/security-updates
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-54499
advisory
-
github.com
/mattermost/mattermost
package
-
github.com
/advisories/GHSA-xr3w-rmvj-f6m7
advisory
Sources
- CVE List CVE-2025-54499
- GitHub Advisory GHSA-xr3w-rmvj-f6m7
- NVD CVE-2025-54499
- OSV GO-2025-4036
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.