CVEvulnerability

CVE-2026-6046

5.3 MEDIUM Published 2026-06-12 Modified 2026-06-18 Official page ↗
Status
Analyzed
Published
2026-06-12
Last modified
2026-06-18
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.3 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Weaknesses
CWE-200

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 configurations

• mattermost mattermost server (>= 10.11.0 < 10.11.17) • mattermost mattermost server (>= 11.5.0 < 11.5.5) • mattermost mattermost server (>= 11.6.0 < 11.6.2)

Related

Weakness · CWE (1)

  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor weakness

References