CVE-2026-45064

Symfony: HtmlSanitizer URL Attributes Pass Through BiDi Override Characters → Visual href Spoofing

MEDIUM

6.1

CVSS Score

Published: July 14, 2026 at 06:35 PM UTC

Updated: July 21, 2026 at 08:17 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-BETA1 until 6.4.40, 7.4.12, and 8.0.12, UrlSanitizer::parse() passes Unicode explicit-direction BiDi formatting characters through into sanitized href and src attributes, allowing sanitized content to display a link destination that visually differs from the actual destination and enabling phishing-style visual spoofing. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.

Affected

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

Symfony · Sensiolabsdrupal

95%

6.1.0 ≤ v < 6.4.407.0.0 ≤ v < 7.4.128.0.0 ≤ v < 8.0.12

Affected range stops below 6.4.40, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.4.12, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.0.12, so it looks safe — our inference, not a vendor statement

Html Sanitizer · Symfony

60%

v < 6.4.40v < 7.4.12v < 8.0.12

Affected range stops below 6.4.40, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.4.12, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.0.12, so it looks safe — our inference, not a vendor statement

Symfony · Symfonycomposer

60%

v < 6.4.40v < 7.4.12v < 8.0.12

Affected range stops below 6.4.40, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.4.12, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.0.12, 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_CONFIRMVendor Advisory

Source: cverecord

https://github.com/symfony/symfony/security/advisories/GHSA-h5vq-qfcg-4m6p

x_refsource_MISCPatch

Source: cverecord

https://github.com/symfony/symfony/commit/743a435e948b897ef2b5564ac438d4beb95d2526

x_refsource_MISCProductRelease Notes

Source: cverecord

https://github.com/symfony/symfony/releases/tag/v6.4.40

x_refsource_MISCProductRelease Notes

Source: cverecord

https://github.com/symfony/symfony/releases/tag/v7.4.12

x_refsource_MISCProductRelease Notes

Source: cverecord

https://github.com/symfony/symfony/releases/tag/v8.0.12

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-451CWE-1007

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