CVE-2026-48761

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

MEDIUM

6.1

CVSS Score

Published: July 14, 2026 at 07:21 PM UTC

Updated: July 21, 2026 at 07:17 PM UTC

3 products affected across 2 vendorsSymfonySymfonyHtml Sanitizer

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Severity

MEDIUM6.1

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Symfony · Sensiolabsdrupal

95%

6.1.0 ≤ v < 6.4.417.0.0 ≤ v < 7.4.138.0.0 ≤ v < 8.0.13

Affected range stops below 6.4.41, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.4.13, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.0.13, so it looks safe — our inference, not a vendor statement

Html Sanitizer · Symfony

60%

v < 6.4.41v < 7.4.13v < 8.0.13

Affected range stops below 6.4.41, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.4.13, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.0.13, so it looks safe — our inference, not a vendor statement

Symfony · Symfonycomposer

60%

v < 6.4.41v < 7.4.13v < 8.0.13

Affected range stops below 6.4.41, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.4.13, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.0.13, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

x_refsource_CONFIRMPatchVendor Advisory

Source: cverecord

https://github.com/symfony/symfony/security/advisories/GHSA-x5qj-865h-mgvm

x_refsource_MISCPatch

Source: cverecord

https://github.com/symfony/symfony/commit/069a70f9f26e61e9de3b7f9a864a86ed24b36bd0

x_refsource_MISCProductRelease Notes

Source: cverecord

https://github.com/symfony/symfony/releases/tag/v6.4.41

x_refsource_MISCProductRelease Notes

Source: cverecord

https://github.com/symfony/symfony/releases/tag/v7.4.13

x_refsource_MISCProductRelease Notes

Source: cverecord

https://github.com/symfony/symfony/releases/tag/v8.0.13

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: CHANGED
Confidentiality: LOW
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-79CWE-1023

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