CVE-2024-29977: Mattermost failed to properly validate synced reactions

August 1, 2024 (updated November 18, 2024)

Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6 fail to properly validate synced reactions, when shared channels are enabled, which allows a malicious remote to create arbitrary reactions on arbitrary posts

References

github.com/advisories/GHSA-jq3g-xqpx-37x3
github.com/mattermost/mattermost
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2024-29977
pkg.go.dev/vuln/GO-2024-3030

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