CVE-2024-39777: Mattermost allows unsolicited invites to expose access to local channels

August 1, 2024 (updated November 18, 2024)

Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5 and 9.8.x <= 9.8.1 fail to disallow unsolicited invites to expose access to local channels, when shared channels are enabled, which allows a malicious remote to send an invite with the ID of an existing local channel, and that local channel will then become shared without the consent of the local admin.

References

github.com/advisories/GHSA-q22q-2rrf-m27p
github.com/mattermost/mattermost
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2024-39777

Code Behaviors & Features

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