Moderate severityNVD Advisory· Published Aug 1, 2024· Updated Aug 1, 2024
Remote username set to an arbitrary string by remote user
CVE-2024-39839
Description
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5, 9.8.x <= 9.8.1 fail to disallow users to set their own remote username, when shared channels were enabled, which allows a user on a remote to set their remote username prop to an arbitrary string, which would be then synced to the local server as long as the user hadn't been synced before.
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-vg6q-84p8-qvqhghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2024-39839ghsaADVISORY
- mattermost.com/security-updatesghsaWEB
- pkg.go.dev/vuln/GO-2024-3024ghsaWEB
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