CVE-2024-39274: Mattermost failed to properly validate that the channel that comes from the sync message is a shared channel

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 properly validate that the channel that comes from the sync message is a shared channel, when shared channels are enabled, which allows a malicious remote to add users to arbitrary teams and channels

References

github.com/advisories/GHSA-cmc8-222c-vqp9
github.com/mattermost/mattermost
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2024-39274
pkg.go.dev/vuln/GO-2024-3028

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