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GHSA-cw7q-5cgc-h3h9

Mattermost fail to prompt for explicit approval before adding a team admin to a private channel

Source: GitHub Advisory Database (reviewed) Low CVE-2025-27715

Packages

EcosystemPackageAffectedFixed in
Go github.com/mattermost/mattermost/server/v8 >= 9.11.0, < 9.11.9 9.11.9

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.