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Medium, CVSS 4.3

Sulu Observable Response Discrepancy on Admin Login

CVE-2023-39343GHSA-wmwf-49vv-p3mr

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (sulu/sulu 2.5.10), 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

  • Packagist sulu/sulu

    Affected
    >= 2.5.0, < 2.5.10
    Fixed in
    2.5.10

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
4.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
EPSS
  • CVE-2023-39343: 0.62% estimated exploitation activity in the next 30 days; percentile 49.89 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact It allows over the Admin Login form to detect which user (username, email) exists and which one do not exist. Impacted by this issue are Sulu installation = 2.5.0 and <2.5.10 using the newer Symfony Security System which is default since Symfony 6.0 but can be enabled in Symfony 5.4. Sulu Installation not using the old Symfony 5.4 security System and previous version are not impacted by this Security issue. Patches The problem has been patched in version 2.5.10. Workarounds Create a custom AuthenticationFailureHandler which does not return the $exception-getMessage(); instead the $exception-getMessageKey(); References Currently no references.

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

    Published from ghsa record GHSA-wmwf-49vv-p3mr

Agent brief

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# Patch Next advisory brief: CVE-2023-39343

Advisory: Sulu Observable Response Discrepancy on Admin Login
IDs: CVE-2023-39343, GHSA-wmwf-49vv-p3mr
Record: https://patchnext.com/advisories/cve-2023-39343 (revision 1, source checked 26 Oct 2026, 14:10 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: sulu/sulu 2.5.10. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist sulu/sulu: affected >= 2.5.0, < 2.5.10; fixed in 2.5.10

## Suggested inspection (read-only)
- Packagist sulu/sulu: 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 sulu/sulu.
- 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-wmwf-49vv-p3mr (GitHub-reviewed advisory GHSA-wmwf-49vv-p3mr lists affected ranges: Packagist sulu/sulu >=2.5.0 <2.5.10)

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