GO-2026-4495 — Vulnetix

GO-2026-4495 PUBLISHED

Mattermost doesn't properly validate channel membership at the time of data retrieval in github.com/mattermost/mattermost-server

Affected Products

Vendor	Product	Versions
github.com	mattermost/mattermost-server	10.11.0+incompatible, 10.11.0+incompatible

Timeline

Feb 23, 2026 CVE Published
Feb 23, 2026 CVE Updated
May 1, 2026 Security Advisory

References

https://github.com/advisories/GHSA-2xf7-hmf6-p64j advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-20796 advisory
https://mattermost.com/security-updates url

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