Medium 5.3Published Jul 14, 2026

CVE-2026-48761Symfony: HtmlSanitizer UrlAttributeSanitizer Misses URL Attributes on <object>, <applet>, <iframe>, <img> and the URL Inside <meta http-equiv="refresh"> content

Updated under an hour ago (Oct 29, 2026, 1:50 PM ET)

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It affects symfony and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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.

CVSS: 5.3 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-79, CWE-1023
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

symfony symfony symfony:symfony (from the name)	from 6.1.0, < 6.4.41; from 7.0.0-BETA1, < 7.4.13; from 8.0.0-BETA1, < 8.0.13	CNA record
symfony html-sanitizer symfony:html_sanitizer (from the name)	from 6.1.0, < 6.4.41; from 7.0.0-BETA1, < 7.4.13; from 8.0.0-BETA1, < 8.0.13	CNA record
sensiolabs symfony sensiolabs: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	NVD

References

References

https://github.com/symfony/symfony/security/advisories/GHSA-x5qj-865h-mgvm	x-refsource-confirm, patch, vendor-advisory
https://github.com/symfony/symfony/commit/069a70f9f26e61e9de3b7f9a864a86ed24b36bd0	x-refsource-misc, patch
https://github.com/symfony/symfony/releases/tag/v6.4.41	x-refsource-misc, product, release-notes
https://github.com/symfony/symfony/releases/tag/v7.4.13	x-refsource-misc, product, release-notes
https://github.com/symfony/symfony/releases/tag/v8.0.13	x-refsource-misc, product, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.