CVE-2026-1046 json
Arbitrary application execution via unvalidated server-controlled URLs in Help menu
published 2026-02-16 8 mo ago modified 2026-10-15 24 d ago also EUVD-2026-6090
- cvss
- 7.6
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 17%
- public exploits
- 0
- none known
Summary
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
Patch / fix
- Mattermost Mattermost 5.13.3.0, 6.0.3.0, 6.1.0
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 8 mo ago
Exploit prediction
0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.6 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:L |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |
Affected products
- Mattermost Mattermost
Classification
- Weakness
-
- CWE-939 Improper Authorization in Handler for Custom URL Scheme
References
-
mattermost.com
/security-updates
vendor-advisory
Sources
- CVE List CVE-2026-1046
- NVD CVE-2026-1046
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