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CVE-2025-27715 Low

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

Exploit probability 0.2%
Published March 25, 2025
Required by Not available
Last source change March 3, 2026

02 / AFFECTED SOFTWARE

Affected packages

Unknown Unknown

26 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
Bitnami mattermost
Go github.com/mattermost/mattermost/server/v8

03 / CONNECTIONS

Connected vulnerabilities

04 / EVIDENCE

Source records

Open Source Vulnerabilities CVE-2025-27715

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.

View original source
Open Source Vulnerabilities GO-2025-3555

Mattermost fail to prompt for explicit approval before adding a team admin to a private channel in github.com/mattermost/mattermost-server

View original source
Open Source Vulnerabilities BIT-mattermost-2025-27715

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.

View original source
Open Source Vulnerabilities GHSA-cw7q-5cgc-h3h9

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.

View original source

05 / REFERENCES

Further evidence