CVE-2026-16048 — Channel member roles accept out-of-scope roles

CVE-2026-16048

Channel member roles accept out-of-scope roles PUBLISHED

Description (CNA)

Mattermost versions 11.8.x <= 11.8.2, 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 fail to restrict channel member role assignment to channel-scoped roles which allows a channel administrator to gain additional channel permissions via the channel member roles API.. Mattermost Advisory ID: MMSA-2026-00697

Affected (CNA)

Vendor / product	Versions
Mattermost / Mattermost	affected 11.8.0 through 11.8.2; affected 11.7.0 through 11.7.6; affected 10.11.0 through 10.11.21; unaffected 11.9.0; unaffected 11.8.3; unaffected 11.7.7; unaffected 10.11.22

CWE

CWE-863

References

https://mattermost.com/security-updates

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.