CVE-2026-9571
EUVD-2026-4330513.07.2026, 09:16
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to invalidate OAuth refresh tokens upon user account deactivation, which allows a deactivated user or an attacker in possession of a valid refresh token to obtain new functional access tokens via the OAuth refresh token grant endpoint.. Mattermost Advisory ID: MMSA-2026-00680Enginsight
Affected Products (NVD)
| Vendor | Product | Version |
|---|---|---|
| mattermost | mattermost_server | 10.11.0 ≤ 𝑥 < 10.11.20 |
| mattermost | mattermost_server | 11.6.0 ≤ 𝑥 < 11.6.5 |
| mattermost | mattermost_server | 11.7.0 ≤ 𝑥 < 11.7.3 |
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
| Vendor | Product | Version | Source |
|---|---|---|---|
| mattermost | mattermost | 11.7.0 ≤ 𝑥 ≤ 11.7.2 | CNA |
| mattermost | mattermost | 11.6.0 ≤ 𝑥 ≤ 11.6.4 | CNA |
| mattermost | mattermost | 10.11.0 ≤ 𝑥 ≤ 10.11.19 | CNA |
Common Weakness Enumeration
Vulnerability Media Exposure
References