PT-2026-47216 · Symfony · Symfony

CVE-2026-48761 · Published 2026-05-27 · Updated 2026-07-14

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Symfony versions prior to 6.4 Symfony versions prior to 7.4 Symfony versions prior to 8.0 Symfony versions prior to 8.1

Description An issue exists in the SymfonyComponentHtmlSanitizerVisitorAttributeSanitizerUrlAttributeSanitizer::getSupportedAttributes() function, which fails to include several URL-bearing attributes in its sanitization list. When integrators explicitly allow elements such as <object>, <applet>, <iframe>, or <img> along with attributes like data, codebase, archive, or longdesc, the UrlSanitizer::sanitize() process is bypassed. This allows payloads such as javascript:alert(1) to remain unchanged in the output, leading to stored Cross-Site Scripting (XSS). Additionally, the content attribute of the <meta> element does not undergo URL sanitization when used for refresh-driven navigation (e.g., <meta http-equiv="refresh" content="0; url=…">), enabling navigation to javascript: URLs.

Recommendations Update to version 6.4 or later. Update to version 7.4 or later. Update to version 8.0 or later. Update to version 8.1 or later.

Exploit

Fix

XSS

Weakness Enumeration

CWE-1023

CWE-79

Related Identifiers

CVE-2026-48761

GHSA-X5QJ-865H-MGVM

Affected Products

Symfony

References · 20

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48761.json · Exploit
• 🔥 https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-48761.yaml · Exploit
• 🔥 https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/html-sanitizer/CVE-2026-48761.yaml · Exploit
• https://github.com/symfony/symfony/commit/069a70f9f26e61e9de3b7f9a864a86ed24b36bd0 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-48761 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-48761 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-x5qj-865h-mgvm · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-48761 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-48761 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-48761 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-48761 · Security Note
• https://osv.dev/vulnerability/CVE-2026-48761 · Vendor Advisory
• https://github.com/symfony/symfony/releases/tag/v7.4.13 · Note
• https://github.com/symfony/symfony/security/advisories/GHSA-x5qj-865h-mgvm · Patch, Vendor Advisory
• https://github.com/symfony/symfony/releases/tag/v6.4.41 · Note