CVE-2026-20719 — DoS via URL Previews Rendering Malicious SVGs

CVE-2026-20719

DoS via URL Previews Rendering Malicious SVGs PUBLISHED

Description (CNA)

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

Affected (CNA)

Vendor / product	Versions
Mattermost / Mattermost	affected 11.4.0 through 11.4.0; affected 11.3.0 through 11.3.1; affected 11.2.0 through 11.2.3; affected 10.11.0 through 10.11.11; unaffected 11.5.0; unaffected 11.4.1; unaffected 11.3.2; unaffected 11.2.4; unaffected 10.11.12

CWE

CWE-754

References

https://mattermost.com/security-updates

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.