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CVE-2025-27933 Moderate

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

Exploit probability 0.2%
Published March 21, 2025
Required by Not available
Last source change August 12, 2026

02 / AFFECTED SOFTWARE

Affected packages

Unknown Unknown

47 explicit affected versions

Go github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost-server/v5
Go github.com/mattermost/mattermost-server/v6
Go github.com/mattermost/mattermost/server/v8
Go github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost/server/v8
Bitnami mattermost

03 / CONNECTIONS

Connected vulnerabilities

04 / EVIDENCE

Source records

Open Source Vulnerabilities CVE-2025-27933

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

View original source
Open Source Vulnerabilities GO-2025-3556

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

View original source
Open Source Vulnerabilities GHSA-h5v9-xw2g-7hrq

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.

View original source
Open Source Vulnerabilities BIT-mattermost-2025-27933

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

View original source

05 / REFERENCES

Further evidence