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Medium severity5.3NVD Advisory· Published Jun 12, 2026· Updated Jun 15, 2026

CVE-2026-6046

CVE-2026-6046

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

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

2
  • Mattermost/Mattermostinferred2 versions
    <=11.6.1 || <=11.5.4 || <=10.11.15 || <=10.11.16+ 1 more
    • (no CPE)range: <=11.6.1 || <=11.5.4 || <=10.11.15 || <=10.11.16
    • (no CPE)range: >=11.6.0 <=11.6.1 or >=11.5.0 <=11.5.4 or >=10.11.0 <=10.11.16

Patches

Vulnerability mechanics

References

1

News mentions

1