CVE-2026-25543

6.3 mediumEPSS 0.3%

Medium (6.3) in htmlsanitizer project htmlsanitizer. EPSS 0.3% chance of exploitation in the next 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.

Severity

CVSS 4.0

6.3 medium

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

CVSS 3.1

6.1 medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 19% of CVEs (scores of 2026-10-31)
CWEs: CWE-79, CWE-116
Published: 2026-02-04
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

htmlsanitizer_project:htmlsanitizer

References

Check your stack JSON