What is CVE-2026-48761?

CVE-2026-48761 is a medium-severity vulnerability in Sensiolabs Symfony, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-07-14.

How severe is CVE-2026-48761?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Sensiolabs Symfony

CVE-2026-48761

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-07-14 · last modified 2026-07-21.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (26.0th percentile), scored 2026-10-13.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Sensiolabs Symfony
Symfony Html-Sanitizer — versions >= 6.1.0, < 6.4.41, >= 7.0.0-BETA1, < 7.4.13, >= 8.0.0-BETA1, < 8.0.13
Symfony — versions >= 6.1.0, < 6.4.41, >= 7.0.0-BETA1, < 7.4.13, >= 8.0.0-BETA1, < 8.0.13

Weakness classification (CWE)

References

github.com/symfony/symfony/security/advisories/GHSA-x5qj-865h-mgvm (Patch, Vendor Advisory)
github.com/symfony/symfony/commit/069a70f9f26e61e9de3b7f9a864a86ed24b36bd0 (Patch)
github.com/symfony/symfony/releases/tag/v6.4.41 (Product, Release Notes)
github.com/symfony/symfony/releases/tag/v7.4.13 (Product, Release Notes)
github.com/symfony/symfony/releases/tag/v8.0.13 (Product, Release Notes)

Frequently asked questions

What is CVE-2026-48761?: CVE-2026-48761 is a medium-severity vulnerability in Sensiolabs Symfony, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-07-14.
How severe is CVE-2026-48761?: Medium severity. CVSS v3 base score is 6.1 out of 10.