CVE-2026-8683
Overly long URLs crash the Mattermost Desktop App
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
Mattermost Desktop App versions <=6.1 5.5.13.0 fail to account for attempting to open extremely long URLs in the Mattermost Desktop App which allows a malicious server owner to crash the application via including a script to call window.open on a very large URL. Mattermost Advisory ID: MMSA-2026-00652
| CWE | CWE-770 |
| Vendor | mattermost |
| Product | mattermost |
| Published | Jun 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Mattermost / Mattermost
0 ≤ 5.5.13
Credits
game0v3r