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CVE-2026-1046— Arbitrary application execution via unvalidated server-controlled URLs in Help menu

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 Desktop App是美国Mattermost公司的一款消息传递桌面版应用程序。 Mattermost Desktop App 6.0版本、6.2.0版本和5.2.13.0版本存在安全漏洞，该漏洞源于未验证帮助链接，可能导致恶意服务器通过用户点击菜单项执行任意可执行文件。

CVSS 7.6 · High EPSS 0.24% · P14
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I. Basic Information for CVE-2026-1046

Vulnerability Information
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Vulnerability Title
Arbitrary application execution via unvalidated server-controlled URLs in Help menu
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost Desktop App versions <=6.0 6.2.0 5.2.13.0 fail to validate help links which allows a malicious Mattermost server to execute arbitrary executables on a user’s system via the user clicking on certain items in the Help menu Mattermost Advisory ID: MMSA-2026-00577
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
自定义URL方案处理程序中的授权不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost Desktop App 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost Desktop App是美国Mattermost公司的一款消息传递桌面版应用程序。 Mattermost Desktop App 6.0版本、6.2.0版本和5.2.13.0版本存在安全漏洞，该漏洞源于未验证帮助链接，可能导致恶意服务器通过用户点击菜单项执行任意可执行文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mattermost Mattermost 0 ~ 6.2.0 -

II. Public POCs for CVE-2026-1046

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III. Intelligence Information for CVE-2026-1046

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Same Patch Batch · Mattermost · 2026-02-16 · 7 CVEs total

CVE-2025-13821 5.7 MEDIUM User profile update exposes password hash and MFA secrets
CVE-2026-0999 5.4 MEDIUM Authentication bypass via userID login when email and username login are disabled
CVE-2025-14350 4.3 MEDIUM Information disclosure via channel mentions in posts
CVE-2026-0997 4.3 MEDIUM Mattermost Zoom Plugin channel preference API lacks authorization checks
CVE-2026-0998 4.3 MEDIUM Mattermost Zoom Plugin allows unauthorized meeting creation and post modification via insu
CVE-2025-14573 3.8 LOW Team Admin Bypass of Invite Permissions via allow_open_invite Field

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-939

V. Comments for CVE-2026-1046

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