CVE-2026-20719
Last modified
CVE-2026-20719 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.35% chance of exploitation in the next 30 days.
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
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost Server | >= 10.11.0, < 10.11.12 |
| Mattermost | Mattermost Server | >= 11.2.0, < 11.2.4 |
| Mattermost | Mattermost Server | >= 11.3.0, < 11.3.2 |
| Mattermost | Mattermost Server | >= 11.4.0, < 11.4.1 |
References
- https://mattermost.com/security-updatesVendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-20719?
How severe is CVE-2026-20719?
How do I fix CVE-2026-20719?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-20713Always-incorrect control flow implementation in some firmwar…4.5
- CVE-2026-20714Out-of-bounds write for some Intel(R) QAT software drivers f…7.8
- CVE-2026-20715Improper input validation in some firmware for some Intel(R)…8.2
- CVE-2026-20716Improper access control for some Intel(R) Processors within …7.2
- CVE-2026-20717Improper input validation for some Intel(R) QAT software dri…6.6
- CVE-2026-20718Incorrect default permissions for some Intel(R) NPU Driver s…5.4
- CVE-2026-2072Cross-Site Scripting vulnerability in Hitachi Infrastructure…6.1
- CVE-2026-20726An out-of-bounds read vulnerability exists in the EMF functi…7.1
- CVE-2026-20727Null pointer dereference for some Intel(R) PROSet/Wireless W…8.3
- CVE-2026-20728Protection mechanism failure for some Intel Extension for Te…5.4
- CVE-2026-2073A vulnerability was determined in itsourcecode School Manage…9.8
- CVE-2026-20730A vulnerability exists in BIG-IP Edge Client and browser VPN…3.3
Are you affected by CVE-2026-20719?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST