CVE-2025-58084

Mattermost Desktop App crashes when clicking on malformed external URL

MEDIUM

6.5

CVSS Score

Published: October 13, 2025 at 07:57 PM UTC

Updated: October 19, 2026 at 04:10 PM UTC

2 products affected across 1 vendorMattermost DesktopMattermost

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mattermost Desktop · Mattermost

95%

v < 5.13.1.0

Mattermost · Mattermost

90%

0 ≤ v ≤ 5.13.0

Vendor states this is fixed in 5.13.1 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://mattermost.com/security-updates

References (1)

Vendor Advisory

Source: cverecord

https://mattermost.com/security-updates

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-1287

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