MEDIUM 4.3 NVD

CVE-2026-95666

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 limit the length of the post ID array accepted by the bulk

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 limit the length of the post ID array accepted by the bulk reactions endpoint which allows an authenticated user to cause excessive database load via a crafted request to {{POST /api/v4/posts/ids/reactions}}.. Mattermost Advisory ID: MMSA-2026-00771

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 4.3 was published on 2026-09-22 via NVD.

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