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Medium severity6.5NVD Advisory· Published Aug 17, 2026· Updated Aug 18, 2026

CVE-2026-10080

CVE-2026-10080

Description

Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fails to validate WebSocket command field types which allows an authenticated user to crash the plugin process and deny service to all Boards users via a custom_focalboard_SUBSCRIBE_TEAM message with a non-string teamId.. Mattermost Advisory ID: MMSA-2026-00687

AI Insight

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

Affected products

3
  • Mattermost/Mattermost2 versions
    cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*range: >=10.11.0,<10.11.22
    • (no CPE)range: <=11.7.6, <=10.11.21, <=11.8.3
  • Mattermost/Boardsllm-fuzzy
    Range: <=11.7.6, <=10.11.21, <=11.8.3

Patches

Vulnerability mechanics

References

1

News mentions

1