CVE-2026-6342 — Group prefix matching bypass for subscriptions
Mattermost Plugins versions <=11.5 11.1.5 10.13.11 11.3.4.0 fail to appropriately check for valid namespaces which allows plugin users to create subscriptions to groups that wer…
Published: 2026-05-18 · CVSS: 4.3 · CVSS 3.1
Mattermost Plugins versions <=11.5 11.1.5 10.13.11 11.3.4.0 fail to appropriately check for valid namespaces which allows plugin users to create subscriptions to groups that were not whitelisted via creating groups that share the same prefix as a whitelisted group. Mattermost Advisory ID: MMSA-2026-00601
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7