External SVG Rendering Vulnerability in Mattermost
CVE-2026-20719

4.3MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
25 March 2026

What is CVE-2026-20719?

Mattermost products prior to specific versions suffer from a vulnerability that allows unauthenticated users to exploit external SVG rendering on link embeds. This can lead to the crashing of both the Mattermost web application and desktop app when users create issues or pull requests on GitHub. To mitigate this risk, it is essential to upgrade to the patched versions disclosed in the Mattermost advisory.

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Deploy the Patch

Affected Version(s)

Mattermost 11.4.0

Mattermost 11.3.0 <= 11.3.1

Mattermost 11.2.0 <= 11.2.3

References

https://mattermost.com/security-updates
vendor-advisory

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

mk7120
JSON
.