MEDIUM 5.5 NVD

CVE-2026-96259

Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to apply the internal-connection filter to OAuth endpoint req

Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to apply the internal-connection filter to OAuth endpoint requests, which allows a System Administrator to make the server issue requests to internal network addresses and read the responses via the configured OAuth token and userinfo endpoints.. Mattermost Advisory ID: MMSA-2026-00776

References

https://mattermost.com/security-updates

Published: 2026-09-22 · Source: NVD · Feed updated: 2026-09-22

This medium severity vulnerability with a CVSS score of 5.5 was published on 2026-09-22 via NVD.

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