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Fencer Vulns
medium 6.1

CVE-2026-48760 json

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

published 2026-06-15 4 mo ago modified 2026-09-10 1 mo ago also GHSA-v3wm-qf9p-c549 , EUVD-2026-44373

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 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.

Patch / fix

  • packagist symfony/html-sanitizer 6.4.41, 7.4.13, 8.0.13
  • packagist symfony/symfony 6.4.41, 7.4.13, 8.0.13
  • sensiolabs symfony 6.4.41, 7.4.13, 8.0.13
  • symfony Debian 13 6.4.41+dfsg-0+deb13u1
  • symfony Debian 14 7.4.13+dfsg-1

debian advisories DEBIAN-CVE-2026-48760

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 5.3 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
CNA 4.0 5.3 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
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, <6.4.41
>=7.0.0, <7.4.13
>=8.0.0, <8.0.13
6.4.41
7.4.13
8.0.13
packagist symfony/symfony
>=6.1.0, <6.4.41
>=7.0.0, <7.4.13
>=8.0.0, <8.0.13
6.4.41
7.4.13
8.0.13

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.