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Vulnerability Details :

CVE-2026-25543

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-04 Feb, 2026 | 21:45
Updated At-05 Feb, 2026 | 18:24
Rejected At-
Credits

HtmlSanitizer has a bypass via template tag

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.

Vendors
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Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:04 Feb, 2026 | 21:45
Updated At:05 Feb, 2026 | 18:24
Rejected At:
▼CVE Numbering Authority (CNA)
HtmlSanitizer has a bypass via template tag

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.

Affected Products
Vendor
mganss
Product
HtmlSanitizer
Versions
Affected
  • < 9.0.892
  • < 9.1.893-beta
Problem Types
TypeCWE IDDescription
CWECWE-116CWE-116: Improper Encoding or Escaping of Output
Type: CWE
CWE ID: CWE-116
Description: CWE-116: Improper Encoding or Escaping of Output
Metrics
VersionBase scoreBase severityVector
4.06.3MEDIUM
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
Version: 4.0
Base score: 6.3
Base severity: MEDIUM
Vector:
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/mganss/HtmlSanitizer/security/advisories/GHSA-j92c-7v7g-gj3f
x_refsource_CONFIRM
https://github.com/mganss/HtmlSanitizer/commit/0ac53dca30ddad963f2b243669a5066933d82b81
x_refsource_MISC
https://www.nuget.org/packages/HtmlSanitizer/9.0.892
x_refsource_MISC
https://www.nuget.org/packages/HtmlSanitizer/9.1.893-beta
x_refsource_MISC
Hyperlink: https://github.com/mganss/HtmlSanitizer/security/advisories/GHSA-j92c-7v7g-gj3f
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/mganss/HtmlSanitizer/commit/0ac53dca30ddad963f2b243669a5066933d82b81
Resource:
x_refsource_MISC
Hyperlink: https://www.nuget.org/packages/HtmlSanitizer/9.0.892
Resource:
x_refsource_MISC
Hyperlink: https://www.nuget.org/packages/HtmlSanitizer/9.1.893-beta
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:04 Feb, 2026 | 22:16
Updated At:05 Feb, 2026 | 14:57

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.06.3MEDIUM
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/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
Type: Secondary
Version: 4.0
Base score: 6.3
Base severity: MEDIUM
Vector:
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/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
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-116Primarysecurity-advisories@github.com
CWE ID: CWE-116
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/mganss/HtmlSanitizer/commit/0ac53dca30ddad963f2b243669a5066933d82b81security-advisories@github.com
N/A
https://github.com/mganss/HtmlSanitizer/security/advisories/GHSA-j92c-7v7g-gj3fsecurity-advisories@github.com
N/A
https://www.nuget.org/packages/HtmlSanitizer/9.0.892security-advisories@github.com
N/A
https://www.nuget.org/packages/HtmlSanitizer/9.1.893-betasecurity-advisories@github.com
N/A
Hyperlink: https://github.com/mganss/HtmlSanitizer/commit/0ac53dca30ddad963f2b243669a5066933d82b81
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/mganss/HtmlSanitizer/security/advisories/GHSA-j92c-7v7g-gj3f
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://www.nuget.org/packages/HtmlSanitizer/9.0.892
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://www.nuget.org/packages/HtmlSanitizer/9.1.893-beta
Source: security-advisories@github.com
Resource: N/A

Change History

0
Information is not available yet

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