Vulnerability · Published Jul 14, 2026 · Assigned by GitHub_M
CVE-2026-48760Symfony: HtmlSanitizer URL Parser Deny Gates Underinclusive: Percent-Encoded BiDi Marks and Unicode Whitespace Bypass Visual-Spoofing Defense
Medium 5.3
In plain English
A medium-severity security flaw in html-sanitizer from symfony. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | symfony | 6.4.41+dfsg-0+deb13u1 | DEBIAN-CVE-2026-48760 |
| Debian:14 | symfony | 7.4.13+dfsg-1 | DEBIAN-CVE-2026-48760 |
| Packagist | symfony/html-sanitizer | 6.4.41 | GHSA-v3wm-qf9p-c549 |
| Packagist | symfony/html-sanitizer | 7.4.13 | GHSA-v3wm-qf9p-c549 |
| Packagist | symfony/html-sanitizer | 8.0.13 | GHSA-v3wm-qf9p-c549 |
| Packagist | symfony/symfony | 8.0.13 | GHSA-v3wm-qf9p-c549 |
| Packagist | symfony/symfony | 6.4.41 | GHSA-v3wm-qf9p-c549 |
| Packagist | symfony/symfony | 7.4.13 | GHSA-v3wm-qf9p-c549 |
| Ubuntu:25.10 | symfony | no fix listed | UBUNTU-CVE-2026-48760 |
| Ubuntu:26.04:LTS | symfony | no fix listed | UBUNTU-CVE-2026-48760 |
| Ubuntu:26.10 | symfony | no fix listed | UBUNTU-CVE-2026-48760 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| symfony | symfony | >= 6.1.0, < 6.4.41>= 7.0.0-BETA1, < 7.4.13>= 8.0.0-BETA1, < 8.0.13 |
| symfony | html-sanitizer | >= 6.1.0, < 6.4.41>= 7.0.0-BETA1, < 7.4.13>= 8.0.0-BETA1, < 8.0.13 |
Weakness: CWE-451, CWE-1007 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
References
- https://github.com/symfony/symfony/security/advisories/GHSA-v3wm-qf9p-c549 x_refsource_CONFIRM
- https://github.com/symfony/symfony/commit/b21a626fd90f5c12d2db432c629eed3e780ba2f8 x_refsource_MISC
- https://github.com/symfony/symfony/releases/tag/v6.4.41 x_refsource_MISC
- https://github.com/symfony/symfony/releases/tag/v7.4.13 x_refsource_MISC
- https://github.com/symfony/symfony/releases/tag/v8.0.13 x_refsource_MISC