Medium severity6.1OSV Advisory· Published Jul 14, 2026· Updated Jul 15, 2026
CVE-2026-45753
CVE-2026-45753
Description
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, UrlAttributeSanitizer::getSupportedAttributes() omits URL-valued attributes including action, formaction, poster, and cite, so configurations that admit those attributes can leave javascript: URIs unsanitized and enable XSS when the resulting HTML is rendered or a victim submits a form or clicks a button. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
symfony/html-sanitizerPackagist | >= 6.1.0, < 6.4.40 | 6.4.40 |
symfony/html-sanitizerPackagist | >= 7.0.0, < 7.4.12 | 7.4.12 |
symfony/html-sanitizerPackagist | >= 8.0.0, < 8.0.12 | 8.0.12 |
symfony/symfonyPackagist | >= 6.1.0, < 6.4.40 | 6.4.40 |
symfony/symfonyPackagist | >= 7.0.0, < 7.4.12 | 7.4.12 |
symfony/symfonyPackagist | >= 8.0.0, < 8.0.12 | 8.0.12 |
Affected products
1- Range: v8.0.11, v7.4.11, v6.4.39, …
Patches
Vulnerability mechanics
References
10- github.com/symfony/symfony/commit/487728e7e180a674a6d4c01bd0cb56161cc441b7nvdPatch
- github.com/symfony/symfony/security/advisories/GHSA-hhg7-c65m-h7ffnvdPatchVendor AdvisoryWEB
- github.com/advisories/GHSA-hhg7-c65m-h7ffghsaADVISORY
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/html-sanitizer/CVE-2026-45753.yamlghsaWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45753.yamlghsaWEB
- github.com/symfony/symfony/commit/26a598fcfc4f903cc55ff202f642ee621839825eghsaWEB
- github.com/symfony/symfony/releases/tag/v6.4.40nvdProductRelease Notes
- github.com/symfony/symfony/releases/tag/v7.4.12nvdProductRelease Notes
- github.com/symfony/symfony/releases/tag/v8.0.12nvdProductRelease Notes
- symfony.com/cve-2026-45753ghsaWEB
News mentions
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