CVE-2026-25543
6.1 · MEDIUMOverview
CVE-2026-25543 is a medium-severity vulnerability affecting htmlsanitizer_project htmlsanitizer. It was published on February 4, 2026 and has a CVSS 3.1 base score of 6.1 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
HtmlSanitizer is a .NET library for cleaning HTML fragments and documents from constructs that can lead to XSS attacks. Prior to versions 9.0.892 and 9.1.893-beta, if the template tag is allowed, its contents are not sanitized. The template tag is a special tag that does not usually render its contents, unless the shadowrootmode attribute is set to open or closed. This issue has been patched in versions 9.0.892 and 9.1.893-beta.
Remediation
Check the references section for vendor advisories and patches from htmlsanitizer_project. Update htmlsanitizer to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| htmlsanitizer_project | htmlsanitizer | >= 0, < 9.0.892 | Affected |
Frequently Asked Questions
What is CVE-2026-25543?
CVE-2026-25543 is a medium-severity vulnerability affecting htmlsanitizer_project htmlsanitizer. It was published on February 4, 2026 and has a CVSS 3.1 base score of 6.1 (MEDIUM).
How severe is CVE-2026-25543?
This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-25543?
Check the references section for vendor advisories and patches from htmlsanitizer_project. Update htmlsanitizer to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-25543?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-25543 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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