CVE-2026-75588
Mattermost Desktop App plugin popout scheme validation bypass
- State
- Published
- Severity
- 2.6 Low
- Published
- Sep 17, 2026
- Updated
- Sep 17, 2026
- Reserved
- Aug 17, 2026
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
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 2.6 Low | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N | Mattermost |
Weaknesses
- CWE-1287 Improper Validation of Specified Type of Input
Affected Products
| Product | Versions |
|---|---|
MattermostMattermost |
|
References
- MMSA-2026-00717vendor-advisory
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.