CVE-2026-96260

Summary

Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to enforce a request body size limit during CSRF validation of plugin requests which allows an authenticated user to exhaust server memory and cause a denial of service via a large request body sent to a plugin endpoint.. Mattermost Advisory ID: MMSA-2026-00775

Affected Software

VendorProductVersion RangeStatus
MattermostMattermost11.9.0 <= 11.9.1affected
MattermostMattermost11.8.0 <= 11.8.5affected
MattermostMattermost11.7.0 <= 11.7.10affected
MattermostMattermost11.10.0 <= 11.10.1affected
MattermostMattermost11.11.0unaffected
MattermostMattermost11.9.2unaffected
MattermostMattermost11.8.6unaffected
MattermostMattermost11.7.11unaffected
MattermostMattermost11.10.2unaffected

Weaknesses

  • CWE-789: CWE-789: Memory Allocation with Excessive Size Value

ADP Enrichment

CISA ADP Vulnrichment

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

References