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CVE-2026-75588

Mattermost Desktop App plugin popout scheme validation bypass PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
Mattermost / Mattermostaffected 0 through 6.2.2; unaffected 6.3.0; unaffected 6.2.3.0

CWE

CWE-1287

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.