CVE-2026-75588— Mattermost Desktop App plugin popout scheme validation bypass
Quick assessment
Affected
Mattermost Mattermost
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Mattermost 桌面应用版本 <=6.2 及 6.2.2.0 在检查目标 URL 是否属于当前连接服务器内部时，未能正确验证 URL 协议（scheme），这允许处于网络位置的攻击者通过一个使用降级 URL 协议的链接，在不安全的连接上加载插件弹出窗口。Mattermost 通告编号：MMSA-2026-007
Affected Version Matrix 3
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mattermost | Mattermost | ≤ 6.2.2 |
affected |
6.3.0 |
unaffected | ||
6.2.3.0 |
unaffected |
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I. Basic Information for CVE-2026-75588
Vulnerability Information
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Vulnerability Title
Mattermost Desktop App plugin popout scheme validation bypass
Source: CVE Program / CVE List V5
Vulnerability 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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1287
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Mattermost | Mattermost | 0 ~ 6.2.2 | - |
|
II. Public POCs for CVE-2026-75588
| # | POC Description | Source Link | Shenlong Link |
|---|
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