Read the docs
TI-2023-25216 Aliases CVE-2023-46733GHSA-m2wj-r6g3-fxfx

Symfony possible session fixation vulnerability

Priority LOW 30CWE-384Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-384.

Summary

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Starting in versions 5.4.21 and 6.2.7 and prior to versions 5.4.31 and 6.3.8, `SessionStrategyListener` does not migrate the session after every successful login. It does so only in case the logged in user changes by means of checking the user identifier. In some use cases, the user identifier doesn't change between the verification phase and the successful login, while the token itself changes from one type (partially-authenticated) to another (fully-authenticated). When this happens, the session id should be regenerated to prevent possible session fixations, which is not the case at the moment. As of versions 5.4.31 and 6.3.8, Symfony now checks the type of the token in addition to the user identifier before deciding whether the session id should be regenerated.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00689 52nd percentileScored 2026-11-07
Fix Fixed symfony (symfony): 5.4.31, 6.3.8symfony/security-http (Packagist): 5.4.31, 6.3.8+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
symfonysymfony5.4.21 to before 5.4.31; 6.2.7 to before 6.3.85.4.31, 6.3.8Patch availableCNA
—symfony/security-http (Packagist)5.4.21 to before 5.4.315.4.31Patch availableGHSA-m2wj-r6g3-fxfx
—symfony/security-http (Packagist)6.2.7 to before 6.3.86.3.8Patch availableGHSA-m2wj-r6g3-fxfx
—symfony/symfony (Packagist)5.4.21 to before 5.4.315.4.31Patch availableGHSA-m2wj-r6g3-fxfx
—symfony/symfony (Packagist)6.2.7 to before 6.3.86.3.8Patch availableGHSA-m2wj-r6g3-fxfx
  • symfony Vendorsymfony Affected 5.4.21 to before 5.4.31; 6.2.7 to before 6.3.8 Fixed in 5.4.31, 6.3.8 Patch available CNA
  • symfony/security-http (Packagist) Vendor— Affected 5.4.21 to before 5.4.31 Fixed in 5.4.31 Patch available GHSA-m2wj-r6g3-fxfx
  • symfony/security-http (Packagist) Vendor— Affected 6.2.7 to before 6.3.8 Fixed in 6.3.8 Patch available GHSA-m2wj-r6g3-fxfx
  • symfony/symfony (Packagist) Vendor— Affected 5.4.21 to before 5.4.31 Fixed in 5.4.31 Patch available GHSA-m2wj-r6g3-fxfx
  • symfony/symfony (Packagist) Vendor— Affected 6.2.7 to before 6.3.8 Fixed in 6.3.8 Patch available GHSA-m2wj-r6g3-fxfx

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*5.4.21 to before 5.4.31; 6.2.7 to before 6.3.8Vulnerablesensiolabs
  • cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:* Versions 5.4.21 to before 5.4.31; 6.2.7 to before 6.3.8 Vulnerable ·sensiolabs

Remediation

  • Fix · CNA symfony (symfony) Fixed in 5.4.31, 6.3.8
  • Fix · GHSA-m2wj-r6g3-fxfx symfony/security-http (Packagist) Fixed in 5.4.31 Advisory →
  • Fix · GHSA-m2wj-r6g3-fxfx symfony/security-http (Packagist) Fixed in 6.3.8 Advisory →
  • Fix · GHSA-m2wj-r6g3-fxfx symfony/symfony (Packagist) Fixed in 5.4.31 Advisory →
  • Fix · GHSA-m2wj-r6g3-fxfx symfony/symfony (Packagist) Fixed in 6.3.8 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-46733
  2. 2026-10-03 Alias added: GHSA-m2wj-r6g3-fxfx

References

Patch 3

Advisory 1

Other 3

  • TI-2024-33775 Ability to change environment from query in symfony/runtime CVSS 3.1HIGH 7.3
  • TI-2026-34283 Twig: The `spaceless` filter implicitly marks its output as safe CVSS 4.0MEDIUM 5.1
  • TI-2022-07667 Code injection in Twig CVSS 3.1CRITICAL 9.8
  • TI-2018-10028 Twig before 2.4.4 allows Server-Side Template Injection (SSTI) via the search search_key… CVSS 3.0CRITICAL 9.8
  • TI-2026-35851 Incorrect authorization in symfony CVSS 4.0HIGH 8.7
  • TI-2026-35264 Improper input validation in symfony CVSS 4.0HIGH 8.3
See all 94 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences