CVE-2026-20719

| EUVD-2026-15485 MEDIUM
2026-03-25 Mattermost GHSA-86vc-mg26-fj6x
4.3
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

Lifecycle Timeline

4
Patch Released
Mar 31, 2026 - 21:13 nvd
Patch available
Analysis Generated
Mar 25, 2026 - 16:47 vuln.today
EUVD ID Assigned
Mar 25, 2026 - 16:47 euvd
EUVD-2026-15485
CVE Published
Mar 25, 2026 - 16:30 nvd
MEDIUM 4.3

Tags

Denial Of Service

Description

Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to prevent rendering of external SVGs on link embeds which allows unauthenticated users to crash the Mattermost webapp and desktop app via creating an issue or PR on GitHub.. Mattermost Advisory ID: MMSA-2026-00595

Analysis

Mattermost fails to properly sanitize external SVG rendering in link embeds, allowing unauthenticated users to trigger denial-of-service conditions in both web and desktop applications. An attacker can create a malicious GitHub issue or pull request containing a crafted external SVG that crashes the Mattermost webapp and desktop client when the link is embedded. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

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Priority Score

22
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +22
POC: 0

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CVE-2026-20719 vulnerability details – vuln.today
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