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CVE-2023-39343

Sulu Observable Response Discrepancy on Admin Login

4.3 MediumFix available

Sulu is an open-source PHP content management system based on the Symfony framework. It allows over the Admin Login form to detect which user (username, email) exists and which one do not exist. Sulu Installation not using the old Symfony 5.4 security System and previous version are not impacted by this Security issue. The vulnerability has been patched in version 2.5.10.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
None

Exploit likelihood

0.62%Up 0.6 points since Aug 4, 2023
90%50%10%1%

What each source reports

CVE List Score used 4.3

Sulu Observable Response Discrepancy on Admin Login

Sulu is an open-source PHP content management system based on the Symfony framework. It allows over the Admin Login form to detect which user (username, email) exists and which one do not exist. Sulu Installation not using the old Symfony 5.4 security System and previous version are not impacted by this Security issue. The vulnerability has been patched in version 2.5.10.

Record
CVE-2023-39343
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-204
Updated
2026-11-02
EUVDEUVD-2023-2374 4.3

Sulu is an open-source PHP content management system based on the Symfony framework. It allows over the Admin Login form to detect which user (username, email) exists and which one do not exist. Sulu Installation not using the old Symfony 5.4 security System and previous version are not impacted by this Security issue. The vulnerability has been patched in version 2.5.10.

Record
EUVD-2023-2374
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-wmwf-49vv-p3mr 4.3

Sulu Observable Response Discrepancy on Admin Login

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.

Record
GHSA-wmwf-49vv-p3mr
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-204
Updated
2026-11-02
NVD 4.3

Sulu is an open-source PHP content management system based on the Symfony framework. It allows over the Admin Login form to detect which user (username, email) exists and which one do not exist. Sulu Installation not using the old Symfony 5.4 security System and previous version are not impacted by this Security issue. The vulnerability has been patched in version 2.5.10.

Record
CVE-2023-39343
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-204
Updated
2026-11-02
OSV 4.3

Sulu Observable Response Discrepancy on Admin Login

Sulu is an open-source PHP content management system based on the Symfony framework. It allows over the Admin Login form to detect which user (username, email) exists and which one do not exist. Sulu Installation not using the old Symfony 5.4 security System and previous version are not impacted by this Security issue. The vulnerability has been patched in version 2.5.10.

Record
CVE-2023-39343
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-204
Updated
2026-11-02
OSVGHSA-wmwf-49vv-p3mr 4.3

Sulu Observable Response Discrepancy on Admin Login

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.

Record
GHSA-wmwf-49vv-p3mr
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-204
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
sulu/sulu
Packagist
 2.5.0 up to 2.5.10
2.5.10
sulu/sulu
Packagist
 2.5.0 up to 2.5.10, plus listed versions
2.5.12.5.22.5.32.5.42.5.5
Show 4 moreShow less
2.5.62.5.72.5.82.5.9
2.5.10

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-39343 is a medium vulnerability (CVSS 4.3) in Sulu, published August 3, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.62%, the 50th percentile. Fixed in sulu/sulu 2.5.10.

References

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