CVE-2025-66400
Last modified
CVE-2025-66400 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. mdast-util-to-hast is an mdast utility to transform to hast. From 13.0.0 to before 13.2.1, multiple (unprefixed) classnames could be added in markdown source by using character references. EPSS estimates a 0.25% chance of exploitation in the next 30 days.
Description
mdast-util-to-hast is an mdast utility to transform to hast. From 13.0.0 to before 13.2.1, multiple (unprefixed) classnames could be added in markdown source by using character references. This could make rendered user supplied markdown code elements appear like the rest of the page. This vulnerability is fixed in 13.2.1.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Unifiedjs | Mdast-Util-To-Hast | >= 13.0.0, < 13.2.1 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2025-66400?
How severe is CVE-2025-66400?
How do I fix CVE-2025-66400?
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 2025
- CVE-2025-66395ChurchCRM is an open-source church management system. Prior …8.8
- CVE-2025-66396ChurchCRM is an open-source church management system. Prior …7.2
- CVE-2025-66397ChurchCRM is an open-source church management system. Prior …8.3
- CVE-2025-66398Signal K Server is a server application that runs on a centr…8.8
- CVE-2025-66399Cacti is an open source performance and fault management fra…8.8
- CVE-2025-6640PDF-XChange Editor U3D File Parsing Use-After-Free Remote Co…7.8
- CVE-2025-66401MCP Watch is a comprehensive security scanner for Model Cont…9.8
- CVE-2025-66402Misskey is an open source, federated social media platform. …6.5
- CVE-2025-66403FileRise is a self-hosted web-based file manager with multi-…5.4
- CVE-2025-66404MCP Server Kubernetes is an MCP Server that can connect to a…8.8
- CVE-2025-66405Portkey.ai Gateway is a blazing fast AI Gateway with integra…9.8
- CVE-2025-66406Step CA is an online certificate authority for secure, autom…5
Are you affected by CVE-2025-66400?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST