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CVE-2026-6046

MEDIUM
5.3
CVSS Severity Score
EPSS Score0.0990%
EPSS Percentile28.75th
PublishedJun 12, 2026
Last ModifiedJun 12, 2026

Vulnerability Description

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-2026-00649

Affected Platforms (CPE)

No CPE configurations currently published for this record.

References & Advisories

🔗 https://mattermost.com/security-updates

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