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
Metrics
Affected Vendors & Products
References
| Link | Providers |
|---|---|
| https://mattermost.com/security-updates |
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History
Tue, 13 Oct 2026 12:15:00 +0000
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| First Time appeared |
Mattermost mattermost Desktop
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| CPEs | cpe:2.3:a:mattermost:mattermost_desktop:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Mattermost mattermost Desktop
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Thu, 17 Sep 2026 20:30:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Mattermost
Mattermost mattermost |
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| Vendors & Products |
Mattermost
Mattermost mattermost |
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| Metrics |
ssvc
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Thu, 17 Sep 2026 15:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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 | |
| Title | Mattermost Desktop App plugin popout scheme validation bypass | |
| Weaknesses | CWE-1287 | |
| References |
| |
| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: Mattermost
Published: 2026-09-17T15:09:40.829Z
Updated: 2026-09-17T19:22:50.101Z
Reserved: 2026-08-17T22:19:32.227Z
Link: CVE-2026-75588
Updated: 2026-09-17T19:22:40.335Z
Status : Analyzed
Published: 2026-09-17T16:17:41.940
Modified: 2026-10-13T12:02:58.587
Link: CVE-2026-75588
No data.