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CVE-2025-27933

Unauthorized Private-to-Public Channel Conversion

5.4 MediumFix available

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

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

0.21%Up 0.2 points since Mar 21, 2025
90%50%10%1%

What each source reports

CVE List Score used 5.4

Unauthorized Private-to-Public Channel Conversion

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

Record
CVE-2025-27933
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02
EUVDEUVD-2025-7204 5.4

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

Record
EUVD-2025-7204
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-h5v9-xw2g-7hrq 5.4

Mattermost allows members with permission to convert public channels to private and convert private to public

Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8 fail to to enforce channel conversion restrictions, which allows members with permission to convert public channels to private ones to also convert private ones to public.

Record
GHSA-h5v9-xw2g-7hrq
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02
NVD 5.4

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

Record
CVE-2025-27933
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02
OSV 5.4

Unauthorized Private-to-Public Channel Conversion

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

Record
CVE-2025-27933
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02
OSVGHSA-h5v9-xw2g-7hrq 5.4

Mattermost allows members with permission to convert public channels to private and convert private to public

Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8 fail to to enforce channel conversion restrictions, which allows members with permission to convert public channels to private ones to also convert private ones to public.

Record
GHSA-h5v9-xw2g-7hrq
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02
OSVBIT-mattermost-2025-27933 No score

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

Record
BIT-mattermost-2025-27933
Updated
2026-11-02
OSVGO-2025-3556 No score

Mattermost allows members with permission to convert public channels to private and convert private to public in github.com/mattermost/mattermost-server

Mattermost allows members with permission to convert public channels to private and convert private to public in github.com/mattermost/mattermost-server

Record
GO-2025-3556
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

Affected packages
PackageAffectedFixed
github.com/mattermost/mattermost/server/v8
Go
 10.4.0 up to 10.4.3
10.4.3
github.com/mattermost/mattermost/server/v8
Go
 10.3.0 up to 10.3.4
10.3.4
github.com/mattermost/mattermost/server/v8
Go
 9.11.0 up to 9.11.9
9.11.9
github.com/mattermost/mattermost-server
Go
 before 9.11.9
9.11.9
github.com/mattermost/mattermost/server/v8
Go
 before 8.0.0-20250218135018-e644e3c8e393
8.0.0-20250218135018-e644e3c8e393
mattermost
Bitnami
 9.11.0 up to 10.0.0, 10.3.0 up to 10.5.1
10.0.010.5.1
github.com/mattermost/mattermost-server
Go
 9.11.0+incompatible up to 9.11.9+incompatible, 10.3.0+incompatible up to 10.3.4+incompatible, 10.4.0+incompatible up to 10.4.3+incompatible
9.11.9+incompatible10.3.4+incompatible10.4.3+incompatible
github.com/mattermost/mattermost-server/v5
Go
 All versions None known
github.com/mattermost/mattermost-server/v6
Go
 All versions None known
govulncheck-vulndb
openSUSE:Tumbleweed
From an advisory covering 30 CVEs
 before 0.0.20250327T184518-1.1
0.0.20250327T184518-1.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-27933 is a medium vulnerability (CVSS 5.4) in Mattermost, published March 21, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.21%, the 11th percentile. Fixed in github.com/mattermost/mattermost/server/v8 10.4.3.

References

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