{"id":"GHSA-h5vq-qfcg-4m6p","aliases":["CVE-2026-45064"],"title":"Symfony's HtmlSanitizer URL Attributes Pass Through BiDi Override Characters → Visual href Spoofing","titleSource":"OSV","descriptionSource":"OSV","declaredSeverity":"MODERATE","description":"### Description\n\n`Symfony\\Component\\HtmlSanitizer\\TextSanitizer\\UrlSanitizer::parse()` (used by `UrlSanitizer::sanitize()` and therefore by every `HtmlSanitizer` config that allows links or media) accepts URLs that contain Unicode explicit-direction BiDi formatting characters: U+202A–U+202E (LRE / RLE / PDF / LRO / RLO) and U+2066–U+2069 (LRI / RLI / FSI / PDI). These characters are passed through unchanged into the `href` / `src` attributes produced by `HtmlSanitizer`. When the resulting HTML is rendered in a browser, the override characters reverse or alter the visual ordering of the URL text, so the displayed link can differ arbitrarily from the actual destination: a classic visual-spoofing / phishing primitive against viewers of sanitized content.\n\n### Resolution\n\n`UrlSanitizer::parse()` now rejects URLs containing the explicit-direction BiDi formatting code points (U+202A–U+202E, U+2066–U+2069) before invoking the underlying URL parser. As an unrelated companion fix in the same patch, spaces inside path/query/fragment are now percent-encoded rather than rejected outright, while spaces in the scheme/authority remain rejected by the post-encoding whitespace check.\n\nThe patch for this issue is available [here](https://github.com/symfony/symfony/commit/743a435e948b897ef2b5564ac438d4beb95d2526) for branch 5.4.\n\n### Credits\n\nSymfony would like to thank Himanshu Anand for reporting the issue and Nicolas Grekas for providing the fix.","severity":"medium","score":6.9,"published":"2026-05-27T20:04:22.000Z","modified":"2026-09-10T03:51:05.868Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"symfony/html-sanitizer","sources":[{"name":"OSV · GHSA-h5vq-qfcg-4m6p","url":"https://osv.dev/vulnerability/GHSA-h5vq-qfcg-4m6p"}],"ranges":[{"events":[{"introduced":"6.1.0"},{"fixed":"6.4.40"}],"type":"ECOSYSTEM"}],"versions":["v6.1.0","v6.1.11","v6.1.9","v6.2.0","v6.2.0-BETA1","v6.2.0-RC1","v6.2.2","v6.2.5","v6.2.7","v6.3.0","v6.3.0-BETA1","v6.3.0-RC1","v6.3.12","v6.3.4","v6.3.7","v6.4.0","v6.4.0-BETA1","v6.4.0-BETA2","v6.4.0-RC1","v6.4.12","v6.4.13","v6.4.17","v6.4.18","v6.4.21","v6.4.24","v6.4.25","v6.4.28","v6.4.3","v6.4.35","v6.4.4","v6.4.7","v6.4.8"],"fixed":["6.4.40"]},{"ecosystem":"Packagist","name":"symfony/html-sanitizer","sources":[{"name":"OSV · 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