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Fencer Vulns
high 7.5

CVE-2026-48489 json

Symfony: Security Firewall Bypass via failure_forward Subrequest: Unauthenticated Access to access_control-Protected GET Routes

published 2026-06-15 4 mo ago modified 2026-09-10 1 mo ago also GHSA-6h46-9jf5-q59x , EUVD-2026-44374

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.53, 6.4.41, 7.4.13, and 8.0.13, DefaultAuthenticationFailureHandler honored the request-supplied _failure_path parameter when failure_forward: true was enabled, allowing an unauthenticated failing login request to dispatch a subrequest to access_control-protected GET routes that skipped firewall listeners. This issue is fixed in versions 5.4.53, 6.4.41, 7.4.13, and 8.0.13.

Patch / fix

  • packagist symfony/security-http 5.4.53, 6.4.41, 7.4.13, 8.0.13
  • packagist symfony/symfony 5.4.53, 6.4.41, 7.4.13, 8.0.13
  • sensiolabs symfony 5.4.53, 6.4.41, 7.4.13, 8.0.13
  • symfony Debian 12 5.4.53+dfsg-0+deb12u1
  • symfony Debian 13 6.4.41+dfsg-0+deb13u1
  • symfony Debian 14 7.4.13+dfsg-1

debian advisories DEBIAN-CVE-2026-48489

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.60% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/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 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
packagist symfony/security-http
<5.4.53
>=6.0.0, <6.4.41
>=7.0.0, <7.4.13
>=8.0.0, <8.0.13
5.4.53
6.4.41
7.4.13
8.0.13
packagist symfony/symfony
<5.4.53
>=6.0.0, <6.4.41
>=7.0.0, <7.4.13
>=8.0.0, <8.0.13
5.4.53
6.4.41
7.4.13
8.0.13

Affected products

  • symfony symfony
  • symfony security-http

Classification

Weakness

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.