CVE-2025-27933 json
Unauthorized Private-to-Public Channel Conversion
published 2025-03-21 19 mo ago modified 2026-09-10 1 mo ago also BIT-mattermost-2025-27933 , EUVD-2025-7204 , GHSA-h5v9-xw2g-7hrq , GO-2025-3556
- cvss
- 5.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 11%
- public exploits
- 0
- none known
Summary
Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8 fail to fail to enforce channel conversion restrictions, which allows members with permission to convert public channels to private ones to also convert private ones to public
Patch / fix
- go github.com/mattermost/mattermost/server/v8 8.0.0-20250218135018-e644e3c8e393, 9.11.9, 10.3.4, 10.4.3
- go github.com/mattermost/mattermost-server 9.11.9, 9.11.9+incompatible, 10.3.4+incompatible, 10.4.3+incompatible
- bitnami mattermost 10.0.0, 10.5.1
- Mattermost Mattermost 9.11.9, 10.3.4, 10.4.3, 10.5.0
- govulncheck-vulndb openSUSE Tumbleweed 0.0.20250327T184518-1.1
opensuse advisories openSUSE-SU-2025:14937-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 19 mo ago
Exploit prediction
0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N |
| GitHub | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N |
| NVD | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
| OSV | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost/server/v8 | >=10.4.0, <10.4.3 >=10.3.0, <10.3.4 >=9.11.0, <9.11.9 <8.0.0-20250218135018-e644e3c8e393 |
10.4.3 10.3.4 9.11.9 8.0.0-20250218135018-e644e3c8e393 |
| go | github.com/mattermost/mattermost-server | <9.11.9 >=9.11.0+incompatible, <9.11.9+incompatible >=10.3.0+incompatible, <10.3.4+incompatible >=10.4.0+incompatible, <10.4.3+incompatible |
9.11.9 9.11.9+incompatible 10.3.4+incompatible 10.4.3+incompatible |
| bitnami | mattermost | >=9.11.0, <10.0.0 >=10.3.0, <10.5.1 |
10.0.0 10.5.1 |
| 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-863 Incorrect Authorization
References
-
mattermost.com
/security-updates
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-27933
advisory, web
-
github.com
/mattermost/mattermost
package
-
github.com
/advisories/GHSA-h5v9-xw2g-7hrq
advisory
Sources
- CVE List CVE-2025-27933
- GitHub Advisory GHSA-h5v9-xw2g-7hrq
- NVD CVE-2025-27933
- OSV BIT-mattermost-2025-27933
- OSV GO-2025-3556
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.