GO-2025-3556 — Vulnetix

GO-2025-3556 PUBLISHED

Mattermost allows members with permission to convert public channels to private and convert private to public in github.com/mattermost/mattermost-server

Affected Products

Vendor	Product	Versions
github.com	mattermost/mattermost/server/v8	0, 0
github.com	mattermost/mattermost-server/v6	0, 0
github.com	mattermost/mattermost-server/v5	0, 0
github.com	mattermost/mattermost-server	9.11.0+incompatible, 9.11.0+incompatible, 10.3.0+incompatible

Timeline

Mar 25, 2025 CVE Published
Feb 4, 2026 CVE Updated
May 1, 2026 Security Advisory

References

https://github.com/advisories/GHSA-h5v9-xw2g-7hrq advisory
https://nvd.nist.gov/vuln/detail/CVE-2025-27933 advisory
https://mattermost.com/security-updates url

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