Symfony: HtmlSanitizer URL Parser Deny Gates Underinclusive: Percent-Encoded BiDi Marks and Unicode Whitespace Bypass Visual-Spoofing Defense

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Summary

CVECVE-2026-48760
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-14 20:17:10 UTC
Updated2026-07-14 20:25:54 UTC
DescriptionSymfony 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, UrlSanitizer::parse() rejected raw BiDi formatting characters but not percent-encoded forms and used an ASCII-only whitespace check, allowing sanitized URLs to retain visual-spoofing characters that downstream consumers could decode or display. This issue is fixed in versions 6.4.41, 7.4.13, and 8.0.13.

Risk And Classification

Primary CVSS: v4.0 5.3 MEDIUM from [email protected]

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-451 | CWE-1007 | CWE-451 CWE-451: User Interface (UI) Misrepresentation of Critical Information | CWE-1007 CWE-1007: Insufficient Visual Distinction of Homoglyphs Presented to User

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary5.3MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/C...
4.0CNADECLARED5.3MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
Passive
Confidentiality
None
Integrity
None
Availability
None
Sub Conf.
Low
Sub Integrity
Low
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Symfony Symfony affected >= 6.1.0, < 6.4.41 Not specified
CNA Symfony Symfony affected >= 7.0.0-BETA1, < 7.4.13 Not specified
CNA Symfony Symfony affected >= 8.0.0-BETA1, < 8.0.13 Not specified
CNA Symfony Html-sanitizer affected >= 6.1.0, < 6.4.41 Not specified
CNA Symfony Html-sanitizer affected >= 7.0.0-BETA1, < 7.4.13 Not specified
CNA Symfony Html-sanitizer affected >= 8.0.0-BETA1, < 8.0.13 Not specified

References

ReferenceSourceLinkTags
github.com/symfony/symfony/releases/tag/v6.4.41 [email protected] github.com
github.com/symfony/symfony/releases/tag/v8.0.13 [email protected] github.com
github.com/symfony/symfony/commit/b21a626fd90f5c12d2db432c629eed3e780ba2f8 [email protected] github.com
github.com/symfony/symfony/security/advisories/GHSA-v3wm-qf9p-c549 [email protected] github.com
github.com/symfony/symfony/releases/tag/v7.4.13 [email protected] github.com
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