CVE-2023-39343: Sulu Observable Response Discrepancy on Admin Login

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-08-04 · updated 2026-06-17
Weakness: CWE-204

Description

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.

Affected products

sulu: from 2.5.0 before 2.5.10 — fixed in 2.5.10

How to fix

Upgrade to a fixed version: sulu 2.5.10. Check the vendor advisory for mitigations.

References

https://github.com/sulu/sulu/commit/5f6c98ba030b2005793e2dc647cc938937ea889b
https://github.com/sulu/sulu/releases/tag/2.5.10
https://github.com/sulu/sulu/security/advisories/GHSA-wmwf-49vv-p3mr
https://github.com/sulu/sulu/commit/5f6c98ba030b2005793e2dc647cc938937ea889b
https://github.com/sulu/sulu/releases/tag/2.5.10
https://github.com/sulu/sulu/security/advisories/GHSA-wmwf-49vv-p3mr

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