CVE-2019-25225 — `sanitize-html` prior to version 2

`sanitize-html` prior to version 2.0.0-beta is vulnerable to Cross-site Scripting (XSS). The `sanitizeHtml()` function in `index.js` does not sanitize content when using the custom `transformTags` option, which is intended to convert attribute values into text. As a result, malic

01What is this vulnerability?

`sanitize-html` prior to version 2.0.0-beta is vulnerable to Cross-site Scripting (XSS). The `sanitizeHtml()` function in `index.js` does not sanitize content when using the custom `transformTags` option, which is intended to convert attribute values into text. As a result, malicious input can be transformed into executable code.

02Affected products

Vendor	Product	Versions
?	?	0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2025-09-08T10:02:42.945Z
• Last modified: 2025-09-08T15:18:19.841Z

09References

• github.com — https://github.com/apostrophecms/sanitize-html/issues/293
• github.com — https://github.com/apostrophecms/sanitize-html/pull/156
• github.com — https://github.com/apostrophecms/sanitize-html/commit/712cb6895825c8bb6ede71a16b…
• github.com — https://github.com/Checkmarx/Vulnerabilities-Proofs-of-Concept/tree/main/2019/CV…