CVE-2026-6046
EUVD-2026-3650212.06.2026, 17:16
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to validate that a username returned during bot registration belongs to a bot account, which allows an unprivileged attacker to intercept private messages sent by plugins via direct message channels by pre-registering a user account with a predictable plugin bot username.. Mattermost Advisory ID: MMSA-2026-00649Enginsight
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
| Vendor | Product | Version | Source |
|---|---|---|---|
| mattermost | mattermost | 11.6.0 ≤ 𝑥 ≤ 11.6.1 | CNA |
| mattermost | mattermost | 11.5.0 ≤ 𝑥 ≤ 11.5.4 | CNA |
| mattermost | mattermost | 10.11.0 ≤ 𝑥 ≤ 10.11.15 | CNA |
| mattermost | mattermost | 10.11.0 ≤ 𝑥 ≤ 10.11.16 | CNA |
Common Weakness Enumeration
References