CVE-2026-4858

Summary

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to check integration URL for path traversal which allows an malicious authenticated user to call an arbitrary API via system admin Mattermost auth token using via path traversal in integration action URL.. Mattermost Advisory ID: MMSA-2026-00640

Affected Software

VendorProductVersion RangeStatus
MattermostMattermost11.6.0 <= 11.6.0affected
MattermostMattermost11.5.0 <= 11.5.3affected
MattermostMattermost11.4.0 <= 11.4.4affected
MattermostMattermost10.11.0 <= 10.11.14affected
MattermostMattermost11.7.0unaffected
MattermostMattermost11.6.1unaffected
MattermostMattermost11.5.4unaffected
MattermostMattermost11.4.5unaffected
MattermostMattermost10.11.15unaffected

Weaknesses

  • CWE-22: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

ADP Enrichment

CISA ADP Vulnrichment

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

References