CVE-2025-27715 json
Auto-Enrollment of Team Admins into Private Channels without explicit consent
published 2025-03-21 19 mo ago modified 2026-06-17 4 mo ago also BIT-mattermost-2025-27715 , EUVD-2025-7203 , GHSA-cw7q-5cgc-h3h9 , GO-2025-3555
- cvss
- 3.3
- 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 12%
- public exploits
- 0
- none known
Summary
Mattermost versions 9.11.x <= 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them.
Patch / fix
- go github.com/mattermost/mattermost/server/v8 9.11.9
- bitnami mattermost 10.0.0
- go github.com/mattermost/mattermost-server 9.11.9+incompatible
- Mattermost Mattermost 9.11.9, 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
0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 3.3 | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N |
| GitHub | 3.1 | 3.3 | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N |
| NVD | 3.1 | 2.7 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N |
| OSV | 3.1 | 2.7 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost/server/v8 | >=9.11.0, <9.11.9 all versions |
9.11.9 |
| bitnami | mattermost | >=9.11.0, <10.0.0 |
10.0.0 |
| go | github.com/mattermost/mattermost-server | >=9.11.0+incompatible, <9.11.9+incompatible |
9.11.9+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-863 Incorrect Authorization
References
-
mattermost.com
/security-updates
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-27715
advisory, web
-
github.com
/mattermost/mattermost
package
-
github.com
/advisories/GHSA-cw7q-5cgc-h3h9
advisory
Sources
- CVE List CVE-2025-27715
- GitHub Advisory GHSA-cw7q-5cgc-h3h9
- NVD CVE-2025-27715
- OSV BIT-mattermost-2025-27715
- OSV GO-2025-3555
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.