CVE-2026-9602

Summary

Mattermost Desktop App versions <=6.2 6.0.2 5.6.13.0 fail to validate payloads sent from the Mattermost Web App to the Desktop App which allows a malicious server owner to crash the Mattermost Desktop App via changing the payload of a method to a malformed one. Mattermost Advisory ID: MMSA-2026-00678

Affected Software

VendorProductVersion RangeStatus
MattermostMattermost0 <= 6.0.2affected
MattermostMattermost0 <= 5.6.13affected
MattermostMattermost6.3.0unaffected
MattermostMattermost6.2.1.0unaffected
MattermostMattermost5.13.7.0unaffected

Weaknesses

  • CWE-400: CWE-400 Uncontrolled Resource Consumption

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References