Medium severity · published Oct 13, 2025
CVE-2025-58084
Mattermost Desktop App crashes when clicking on malformed external URL
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
Mattermost Desktop App versions <= 5.13.0 fail to validate URLs external to the configured Mattermost servers, allowing an attacker on a server the user has configured to crash the user's application by sending the user a malformed URL.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 22% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
Mattermost · Mattermost
through 5.13.0 · source: vendor
MD
Mattermost Desktop · Mattermost
before 5.13.1.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-58084
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-58084
Vendor Advisory
https://mattermost.com/security-updates
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