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CVE PROGRAM SOURCE RECORD5.5 Medium

CVE-2026-96259

Mattermost server-side request forgery via OAuth endpoints configurable by a System Administrator

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Status
Published
Published
Updated
Assigning organization
Mattermost

Description

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 apply the internal-connection filter to OAuth endpoint requests, which allows a System Administrator to make the server issue requests to internal network addresses and read the responses via the configured OAuth token and userinfo endpoints.. Mattermost Advisory ID: MMSA-2026-00776

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Mattermost Mattermost

Default version status: unaffected

  • 11.9.0 to ≤ 11.9.1affected
  • 11.8.0 to ≤ 11.8.5affected
  • 11.7.0 to ≤ 11.7.10affected
  • 11.10.0 to ≤ 11.10.1affected
  • 11.11.0unaffected
  • 11.9.2unaffected
  • 11.8.6unaffected
  • 11.7.11unaffected
  • 11.10.2unaffected

References