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Fencer Vulns
medium 6.1

CVE-2026-45064 json

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

published 2026-05-27 5 mo ago modified 2026-09-10 1 mo ago also GHSA-h5vq-qfcg-4m6p , EUVD-2026-44348

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 27%
public exploits
0
none known

Summary

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.

Patch / fix

  • packagist symfony/html-sanitizer 6.4.40, 7.4.12, 8.0.12
  • packagist symfony/symfony 6.4.40, 7.4.12, 8.0.12
  • sensiolabs symfony 6.4.40, 7.4.12, 8.0.12
  • symfony Debian 13 6.4.41+dfsg-0+deb13u1
  • symfony Debian 14 7.4.12+dfsg-1

debian advisories DEBIAN-CVE-2026-45064

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 2.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CNA 4.0 2.3 CVSS:4.0/AV:N/AC:L/AT:P/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
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
packagist symfony/html-sanitizer
>=6.1.0, <6.4.40
>=7.0.0, <7.4.12
>=8.0.0, <8.0.12
6.4.40
7.4.12
8.0.12
packagist symfony/symfony
>=6.1.0, <6.4.40
>=7.0.0, <7.4.12
>=8.0.0, <8.0.12
6.4.40
7.4.12
8.0.12

Affected products

  • symfony symfony
  • symfony html-sanitizer

Classification

Weakness
  • CWE-451 User Interface (UI) Misrepresentation of Critical Information
  • CWE-1007 Insufficient Visual Distinction of Homoglyphs Presented to User

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.