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Medium severity4.3NVD Advisory· Published Sep 22, 2026· Updated Oct 7, 2026

CVE-2026-95666

CVE-2026-95666

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

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

2
  • Mattermost/Mattermost2 versions
    cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*range: >=11.7.0,<11.7.11
    • (no CPE)range: <=11.9.1, <=11.8.5, <=11.7.10, <=11.10.1

Patches

Vulnerability mechanics

References

1

News mentions

1