CVE-2025-27715
Auto-Enrollment of Team Admins into Private Channels without explicit consent
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Auto-Enrollment of Team Admins into Private Channels without explicit consent
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.
- Record
CVE-2025-27715- CVSS 3.1
- 3.3 Low
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-863
- Updated
- 2026-11-02
EUVDEUVD-2025-7203
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.
- Record
EUVD-2025-7203- CVSS 3.1
- 3.3 Low
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-cw7q-5cgc-h3h9
Mattermost fail to prompt for explicit approval before adding a team admin to a private channel
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.
- Record
GHSA-cw7q-5cgc-h3h9- CVSS 3.1
- 3.3 Low
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-863
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2025-27715- CVSS 3.1
- 3.3 Low
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N - CVSS 3.1
- 2.7 Low
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-863
- Updated
- 2026-11-02
OSV
Auto-Enrollment of Team Admins into Private Channels without explicit consent
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.
- Record
CVE-2025-27715- CVSS 3.1
- 3.3 Low
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-863
- Updated
- 2026-11-02
OSVGHSA-cw7q-5cgc-h3h9
Mattermost fail to prompt for explicit approval before adding a team admin to a private channel
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.
- Record
GHSA-cw7q-5cgc-h3h9- CVSS 3.1
- 3.3 Low
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-863
- Updated
- 2026-11-02
OSVBIT-mattermost-2025-27715 No score
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.
- Record
BIT-mattermost-2025-27715- Updated
- 2026-11-02
OSVGO-2025-3555 No score
Mattermost fail to prompt for explicit approval before adding a team admin to a private channel in github.com/mattermost/mattermost-server
Mattermost fail to prompt for explicit approval before adding a team admin to a private channel in github.com/mattermost/mattermost-server
- Record
GO-2025-3555- Updated
- 2026-11-02
OSVopenSUSE-SU-2025:14937-1 No score
govulncheck-vulndb-0.0.20250327T184518-1.1 on GA media
These are all security issues fixed in the govulncheck-vulndb-0.0.20250327T184518-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2025:14937-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
github.com/mattermost/mattermost/server/v8Go |
9.11.0 up to 9.11.9 | 9.11.9 |
mattermostBitnami |
9.11.0 up to 10.0.0 | 10.0.0 |
github.com/mattermost/mattermost-serverGo |
9.11.0+incompatible up to 9.11.9+incompatible | 9.11.9+incompatible |
github.com/mattermost/mattermost-server/v5Go |
All versions | None known |
github.com/mattermost/mattermost-server/v6Go |
All versions | None known |
github.com/mattermost/mattermost/server/v8Go |
All versions | None known |
govulncheck-vulndbopenSUSE:Tumbleweed From an advisory covering 30 CVEs |
before 0.0.20250327T184518-1.1 | 0.0.20250327T184518-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-27715 is a low vulnerability (CVSS 3.3) in Mattermost, published March 21, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.22%, the 12th percentile. Fixed in github.com/mattermost/mattermost/server/v8 9.11.9.
References
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2025-27715
github.com/advisories/GHSA-cw7q-5cgc-h3h9
lists.opensuse.org/archives/list/[email protected]/thread/NEVFAGUWHTVZSJTUAIU6C4S26DP2KIGB
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suse.com/security/cve/CVE-2024-25132