Vulnerability · Published Jul 14, 2026 · Assigned by GitHub_M
CVE-2026-48761Symfony: HtmlSanitizer UrlAttributeSanitizer Misses URL Attributes on <object>, <applet>, <iframe>, <img> and the URL Inside <meta http-equiv="refresh"> content
Medium 5.3
In plain English
A medium-severity cross-site scripting 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 28% 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, UrlAttributeSanitizer::getSupportedAttributes() omitted URL-bearing attributes on <object>, <applet>, <iframe>, and <img>, and <meta http-equiv="refresh"> URLs inside content bypassed URL sanitization, allowing explicitly enabled elements or attributes to pass javascript: and similar payloads into sanitized output. 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-2026-48761 |
| Debian:14 | symfony | 7.4.13+dfsg-1 | DEBIAN-CVE-2026-48761 |
| Packagist | symfony/html-sanitizer | 6.4.41 | GHSA-x5qj-865h-mgvm |
| Packagist | symfony/html-sanitizer | 7.4.13 | GHSA-x5qj-865h-mgvm |
| Packagist | symfony/html-sanitizer | 8.0.13 | GHSA-x5qj-865h-mgvm |
| Packagist | symfony/symfony | 8.0.13 | GHSA-x5qj-865h-mgvm |
| Packagist | symfony/symfony | 6.4.41 | GHSA-x5qj-865h-mgvm |
| Packagist | symfony/symfony | 7.4.13 | GHSA-x5qj-865h-mgvm |
| Ubuntu:25.10 | symfony | no fix listed | UBUNTU-CVE-2026-48761 |
| Ubuntu:26.04:LTS | symfony | no fix listed | UBUNTU-CVE-2026-48761 |
| Ubuntu:26.10 | symfony | no fix listed | UBUNTU-CVE-2026-48761 |
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-79, CWE-1023 · 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-x5qj-865h-mgvm x_refsource_CONFIRM
- https://github.com/symfony/symfony/commit/069a70f9f26e61e9de3b7f9a864a86ed24b36bd0 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