Is CVE-2026-25543 in the CISA KEV catalog?

No. CVE-2026-25543 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-25543?

CVE-2026-25543 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2026-25543?

CVE-2026-25543 has an EPSS score of 0.24% (15th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-25543?

Upgrade htmlsanitizer to 9.1.893 or later.

CVE & CISA-KEV Catalog

CVE-2026-25543

MEDIUM

6.1

CVSS v3

NVD

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.

CWE-116 CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

htmlsanitizerNVD

Affected:>= 9.1.878, < 9.1.893Fixed in:9.1.893CVE-2026-25543derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.24%probability of exploitation in 30 days

15thpercentile

Low risk: more likely to be exploited than 15% of all known CVEs.

References

Patch2

Release Notes2

Related Vulnerabilities

Other CWE-116 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-38475	Critical	9.1	100%	KEV	Fix
CVE-2022-36446	Critical	9.8	96%	-	Fix
CVE-2021-31806	Medium	6.5	96%	-	Fix
CVE-2022-30781	High	7.5	88%	-	Fix
CVE-2022-36099	Critical	9.9	76%	-	Fix
CVE-2022-36100	Critical	9.9	74%	-	Fix

Embed a live status badge for CVE-2026-25543

Markdown

[![CVE-2026-25543](https://tridentstack.com/cve/badge/CVE-2026-25543.svg)](https://tridentstack.com/cve/CVE-2026-25543)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-25543"><img src="https://tridentstack.com/cve/badge/CVE-2026-25543.svg" alt="CVE-2026-25543"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-02-24.