CVE-2026-95666
EUVD-2026-8437822.09.2026, 14:17
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-2026-00771EnginsightAffected Products (NVD)
| Vendor | Product | Version |
|---|---|---|
| mattermost | mattermost_server | 11.7.0 ≤ 𝑥 < 11.7.11 |
| mattermost | mattermost_server | 11.8.0 ≤ 𝑥 < 11.8.6 |
| mattermost | mattermost_server | 11.9.0 ≤ 𝑥 < 11.9.2 |
| mattermost | mattermost_server | 11.10.0 ≤ 𝑥 < 11.10.2 |
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources
(CNA/ADP records, vendor advisories, Enginsight analysis).
| Vendor | Product | Version | Source |
|---|---|---|---|
| mattermost | mattermost | 11.9.0 ≤ 𝑥 ≤ 11.9.1 | CNA |
| mattermost | mattermost | 11.8.0 ≤ 𝑥 ≤ 11.8.5 | CNA |
| mattermost | mattermost | 11.7.0 ≤ 𝑥 ≤ 11.7.10 | CNA |
| mattermost | mattermost | 11.10.0 ≤ 𝑥 ≤ 11.10.1 | CNA |
References