CVE Watchtower

CVE-2026-16048NVD

Vulnerability Summary

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

Severity Level

MEDIUM(6.3)

Published Date

Aug 17, 2026

Last Modified

Aug 18, 2026

Exploitation Status

No confirmed exploitation yet

EPSS Score (30-Day)

0.15%Probability

Root Weakness (CWE)

CWE-863: Unknown/Unlisted Weakness ↗

Refer to the official MITRE database for detailed architectural specifications regarding this weakness.

CVSS v3.1 Base Metrics

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

ConfidentialityLow

IntegrityLow

AvailabilityLow

External References

https://mattermost.com/security-updates

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