CVE-2026-6342 — Group prefix matching bypass for subscriptions

CVE-2026-6342

Group prefix matching bypass for subscriptions PUBLISHED

Description (CNA)

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

Affected (CNA)

Vendor / product	Versions
Mattermost / Mattermost	affected 0 through 11.1.5; affected 0 through 10.13.11; affected 0 through 11.3.4; unaffected 11.6.0; unaffected 11.5.2; unaffected 10.11.14; unaffected 11.4.4

CWE

CWE-863

References

https://mattermost.com/security-updates

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.