CVE-2026-20719
DoS via URL Previews Rendering Malicious SVGs
CVSS Score
4.3
EPSS Score
0.0%
EPSS Percentile
12th
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
| CWE | CWE-754 |
| Vendor | mattermost |
| Product | mattermost |
| Published | Mar 25, 2026 |
| Last Updated | Mar 26, 2026 |
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CVSS v3 Breakdown
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
Affected Versions
Mattermost / Mattermost
11.4.0 ≤ 11.4.0 11.3.0 ≤ 11.3.1 11.2.0 ≤ 11.2.3 10.11.0 ≤ 10.11.11
Credits
mk7120