Critical severityNVD Advisory· Published Aug 1, 2024· Updated Aug 2, 2024
Malicious remote can add users to arbitrary teams and channels
CVE-2024-39274
Description
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
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/mattermost/mattermost/server/v8Go | >= 9.5.0, < 9.5.7 | 9.5.7 |
github.com/mattermost/mattermost/server/v8Go | >= 9.7.0, < 9.7.6 | 9.7.6 |
github.com/mattermost/mattermost/server/v8Go | >= 9.8.0, < 9.8.2 | 9.8.2 |
github.com/mattermost/mattermost/server/v8Go | >= 9.9.0, < 9.9.1 | 9.9.1 |
Affected products
1- Range: 9.9.0
Patches
355b24d27c857d45148a4586633db68643e85Vulnerability mechanics
Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
References
4- github.com/advisories/GHSA-cmc8-222c-vqp9ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2024-39274ghsaADVISORY
- mattermost.com/security-updatesghsaWEB
- pkg.go.dev/vuln/GO-2024-3028ghsaWEB
News mentions
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