What is the CVSS score of CVE-2025-52561?

CVE-2025-52561 has a CVSS 4.0 base score of 6.9 (Medium). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N. EPSS exploitation probability: 0.2%.

Which versions of HTMLSanitizer.jl are affected by CVE-2025-52561?

Organizations using HTMLSanitizer.jl should be aware of notable risk from CVE-2025-52561, a cross-site scripting vulnerability rated CVSS 6.9.. A patch is available.

How to fix or mitigate CVE-2025-52561?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

HTMLSanitizer.jl CVE-2025-52561

EUVD-2025-28447 MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2025-06-23 security-advisories@github.com

XSS

6.9

CVSS 4.0 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.9 MEDIUM

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Lifecycle Timeline

Patch available

Apr 16, 2026 - 05:29 EUVD

0.2.1

EUVD ID Assigned

Mar 15, 2026 - 22:10 euvd

EUVD-2025-28447

Analysis Generated

Mar 15, 2026 - 22:10 vuln.today

CVE Published

Jun 23, 2025 - 21:15 nvd

MEDIUM 6.9

DescriptionGitHub Advisory

HTMLSanitizer.jl is a Whitelist-based HTML sanitizer. Prior to version 0.2.1, when adding the style tag to the whitelist, content inside the tag is incorrectly unescaped, and closing tags injected as content are interpreted as real HTML, enabling tag injection and JavaScript execution. This could result in possible cross-site scripting (XSS) in any HTML that is sanitized with this library. This issue has been patched in version 0.2.1. A workaround involves adding the math and svg elements to the whitelist manually.