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Vulnerability IntelligenceCVE-2026-20719

CVE-2026-20719

MEDIUM4.3

DoS via URL Previews Rendering Malicious SVGs

Published Mar 25, 2026

Modified 3 weeks ago

Details

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

References

https://mattermost.com/security-updates

https://www.cve.org/CVERecord?id=CVE-2026-20719

CVSS Analysis

CVSS v3.1

4.3

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

LowPR:L

User Interaction

NoneUI:N

Scope

Scope

UnchangedS:U

Impact

Confidentiality

NoneC:N

Integrity

NoneI:N

Availability

LowA:L

4.3/CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Weakness Type (CWE)

Other

Ecosystems

Timeline

PublishedMar 25, 2026

ModifiedMar 26, 2026

CVE-2026-20719 | Mondoo Vulnerability Intelligence