Security Advisory

CVE-2026-95666

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-09-22 13:11:13

Last updated 2026-09-22 13:57:00

Assigner Mattermost

CVSS score 4.3

State PUBLISHED

Description

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

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