CVE-2025-52561
CVE-2025-52561 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Medium (CVSS 4.0 base score 6.9)
- EPSS exploit prediction: 1% (49th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-28447
- Weakness: CWE-79
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2025-52561?
- 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.
- How severe is CVE-2025-52561?
- CVE-2025-52561 has a CVSS 4.0 base score of 6.9, rated medium severity.
- Is CVE-2025-52561 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2025-52561?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2025-52561 have an EU (EUVD) identifier?
- Yes. CVE-2025-52561 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-28447.
- When was CVE-2025-52561 published?
- CVE-2025-52561 was published on 2025-06-23 and last updated on 2026-06-17.
References
- https://github.com/JuliaComputing/HTMLSanitizer.jl/commit/0c3dc359e4a64c39cac609541945c0518feef040
- https://github.com/JuliaComputing/HTMLSanitizer.jl/pull/5
- https://github.com/JuliaComputing/HTMLSanitizer.jl/security/advisories/GHSA-3mj7-qxh9-6q4p
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