AIKIDO-2026-182225
html_sanitize_ex is vulnerable to URL Redirection to Untrusted Site ('Open Redirect')
23
CVE Score
Low
URL Redirection to Untrusted Site ('Open Redirect')
TL;DR
The HTML5 scrubber keeps meta elements in its sanitized output. Because a meta refresh acts on the whole document rather than the embedded fragment, sanitized content can navigate a visitor to an external site or declare document-wide directives such as a Content-Security-Policy. Filtering only lowercase schemes does not prevent the redirect, though it does not by itself yield script execution. The fix sanitizes meta elements.
How do I fix this?
Upgrade the html_sanitize_ex library to the patch version.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you use the HtmlSanitizeEx.html5/1 scrubber, or a custom scrubber extending :html5, and render the sanitized output to other users.
Package
Versions
0.3.1 - 1.5.2
Fixed in 1.5.3Background info
html_sanitize_ex is vulnerable to URL Redirection to Untrusted Site ('Open Redirect') in versions 0.3.1 - 1.5.2.
Links
GitHub Release
Fix Commits
github.com/rrrene/html_sanitize_ex/commit/29454dc99513fd9b5b6429ab7b6695ad09889227github.com/rrrene/html_sanitize_ex/commit/9f7e38be51edc38f132dfe994f37af5cf5e0e76f
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