Medium 6.1Published Feb 4, 2026

CVE-2026-25543HtmlSanitizer is a .NET library for cleaning HTML fragments and documents from constructs that can lead to XSS attacks.

Updated under an hour ago (2026-10-19 06:30 UTC)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for htmlsanitizer_project htmlsanitizer

Exploited in the last 30 days

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.

CVSS: 6.1 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-116, CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jun 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

htmlsanitizer_project htmlsanitizer htmlsanitizer_project:htmlsanitizer	before 9.0.892; from 9.1.878 before 9.1.893	NVD

References

https://github.com/mganss/HtmlSanitizer/commit/0ac53dca30ddad963f2b243669a5066933d82b81patch
https://github.com/mganss/HtmlSanitizer/security/advisories/GHSA-j92c-7v7g-gj3fmitigation, patch, vendor-advisory
https://www.nuget.org/packages/HtmlSanitizer/9.0.892product, release-notes
https://www.nuget.org/packages/HtmlSanitizer/9.1.893-betaproduct, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.