AIKIDO-2026-10872
symfony/html-sanitizer is vulnerable to User Interface (UI) Misrepresentation of Critical Information
61
Medium Risk
This Affects:
symfony/html-sanitizerTL;DR
UrlSanitizer allows explicit-direction Unicode BiDi formatting characters in sanitized URL attributes. Those characters can change the visual order of link text or URLs in rendered HTML. Pre-fix sanitized content can display a destination differently from the real link target, enabling phishing-style spoofing. The fix rejects URLs containing those BiDi control characters.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
symfony/html-sanitizer is vulnerable to User Interface (UI) Misrepresentation of Critical Information in versions 6.1.0 - 6.4.39, 7.0.0 - 7.4.11 and 8.0.0 - 8.0.11.
How to fix this
Upgrade the symfony/html-sanitizer and/or symfony/symfony library to the patch version.
Links
GitHub Releases
github.com/symfony/html-sanitizer/releases/tag/v8.0.12github.com/symfony/symfony/releases/tag/v6.4.40github.com/symfony/symfony/releases/tag/v7.4.12github.com/symfony/symfony/releases/tag/v8.0.12
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