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CVE PROGRAM SOURCE RECORD2.6 Low

CVE-2026-75588

Mattermost Desktop App plugin popout scheme validation bypass

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Status
Published
Published
Updated
Assigning organization
Mattermost

Description

Mattermost Desktop App versions <=6.2 6.2.2.0 fail to validate the URL scheme when checking whether a target URL is internal to the connected server, which allows a network-positioned attacker to load a plugin popout window over an insecure connection via a link using a downgraded URL scheme. Mattermost Advisory ID: MMSA-2026-00717

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

  • 0 to ≤ 6.2.2affected
  • 6.3.0unaffected
  • 6.2.3.0unaffected

References