What’s Vulnerable › Vulnerabilities

CVE-2026-48760: Symfony: HtmlSanitizer URL Parser Deny Gates Underinclusive: Percent-Encoded BiDi Marks and Unicode Whitespace Bypass Visual-Spoofing Defense

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-14 · updated 2026-07-15
• Weakness: CWE-451

Description

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0 until 6.4.41, 7.4.13, and 8.0.13, UrlSanitizer::parse() rejected raw BiDi formatting characters but not percent-encoded forms and used an ASCII-only whitespace check, allowing sanitized URLs to retain visual-spoofing characters that downstream consumers could decode or display. This issue is fixed in versions 6.4.41, 7.4.13, and 8.0.13.

Affected products

• symfony: from 6.1.0 before 6.4.41; from 7.0.0 before 7.4.13; from 8.0.0 before 8.0.13 — fixed in 6.4.41, 7.4.13, 8.0.13

How to fix

Upgrade to a fixed version: symfony 6.4.41, 7.4.13, 8.0.13. Check the vendor advisory for mitigations.

References

• https://github.com/symfony/symfony/commit/b21a626fd90f5c12d2db432c629eed3e780ba2f8
• https://github.com/symfony/symfony/releases/tag/v6.4.41
• https://github.com/symfony/symfony/releases/tag/v7.4.13
• https://github.com/symfony/symfony/releases/tag/v8.0.13
• https://github.com/symfony/symfony/security/advisories/GHSA-v3wm-qf9p-c549

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