CVE-2025-6226 json
IDOR in CreatePost API allows for timeboxed message disclosure
published 2025-07-18 15 mo ago modified 2026-06-17 4 mo ago also GHSA-7h34-9chr-58qh , GO-2025-3819 , EUVD-2025-21867
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 31%
- public exploits
- 0
- none known
Summary
Mattermost versions 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 fail to verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user to read posts in private channels they don't have access to via guessing the PendingPostID of recently created posts.
Patch / fix
- go github.com/mattermost/mattermost-server 9.11.17, 9.11.17+incompatible, 10.5.7, 10.5.7+incompatible, 10.7.4, 10.7.4+incompatible, 10.8.2, 10.8.2+incompatible
- go github.com/mattermost/mattermost/server/v8 8.0.0-20250520130510-fa40a8c5d47f
- Mattermost Mattermost 9.11.17, 10.5.8, 10.7.4, 10.8.2, 10.9.0
- govulncheck-vulndb openSUSE Tumbleweed 0.0.20250730T213748-1.1
opensuse advisories openSUSE-SU-2025:15405-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 15 mo ago
Exploit prediction
0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-server | >=10.5.0, <10.5.7 >=10.8.0, <10.8.2 >=10.7.0, <10.7.4 >=9.11.0, <9.11.17 >=9.11.0+incompatible, <9.11.17+incompatible >=10.5.0+incompatible, <10.5.7+incompatible >=10.7.0+incompatible, <10.7.4+incompatible >=10.8.0+incompatible, <10.8.2+incompatible |
10.5.7 10.8.2 10.7.4 9.11.17 9.11.17+incompatible 10.5.7+incompatible 10.7.4+incompatible 10.8.2+incompatible |
| go | github.com/mattermost/mattermost/server/v8 | <8.0.0-20250520130510-fa40a8c5d47f |
8.0.0-20250520130510-fa40a8c5d47f |
| 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-306 Missing Authentication for Critical Functionality
References
Sources
- CVE List CVE-2025-6226
- GitHub Advisory GHSA-7h34-9chr-58qh
- NVD CVE-2025-6226
- OSV GO-2025-3819
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.