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GHSA-ff85-qw3h-g9vp

Mattermost allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL

Source: GitHub Advisory Database (reviewed) Moderate CVE-2025-55073

Packages

EcosystemPackageAffectedFixed in
Go github.com/mattermost/mattermost-server >= 10.11.0, < 10.11.4 10.11.4
Go github.com/mattermost/mattermost-server >= 10.5.0, < 10.5.12 10.5.12
Go github.com/mattermost/mattermost-server >= 10.12.0, < 10.12.1 10.12.1
Go github.com/mattermost/mattermost/server/v8 < 8.0.0-20250929212932-a41db04d2746 8.0.0-20250929212932-a41db04d2746

Details

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

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.

References

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