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High, CVSS 8.2

Auth0 Symfony SDK has Insufficient Entropy in Cookie Encryption

GHSA-ghc5-95c2-vwcv

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (auth0/symfony 5.8.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
8.2 · CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Impact In applications built with the Auth0 PHP SDK, cookies are encrypted with insufficient entropy, which may result in threat actors brute-forcing the encryption key and forging session cookies. Am I Affected? Consumers are affected if their application meets the following preconditions: - It uses the Auth0 Symfony SDK, versions between 5.0.0 and 5.7.0 - Auth0 Symfony SDK using the Auth0-PHP SDK versions between 8.0.0 to 8.18.0. Resolution Upgrade Auth0/symfony-auth0 to version 5.8.0 or greater.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-ghc5-95c2-vwcv

Agent brief

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# Patch Next advisory brief: GHSA-ghc5-95c2-vwcv

Advisory: Auth0 Symfony SDK has Insufficient Entropy in Cookie Encryption
IDs: GHSA-ghc5-95c2-vwcv
Record: https://patchnext.com/advisories/ghsa-ghc5-95c2-vwcv (revision 1, source checked 26 Oct 2026, 14:39 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: auth0/symfony 5.8.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist auth0/symfony: affected >= 5.0.0, <= 5.7.0; fixed in 5.8.0

## Suggested inspection (read-only)
- Packagist auth0/symfony: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on auth0/symfony.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-ghc5-95c2-vwcv (GitHub-reviewed advisory GHSA-ghc5-95c2-vwcv lists affected ranges: Packagist auth0/symfony >=5.0.0 <=5.7.0)

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