TYPO3-EXT-SA-2018-006: Captcha bypass in extension "Front End User Registration" (sr_feuser_register)

Categories: Security Created by Torben Hansen
It has been discovered that the extension "Front End User Registration" (sr_feuser_register) is susceptible to Captcha bypass.
  • Release Date: August 9, 2018
  • Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
  • Vulnerability Type: Captcha bypass
  • Affected Versions: 5.0.0 and below 
  • Severity: Medium
  • Suggested CVSS v3.0: AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
  • CVE: not assigned yet

Problem Description

When the extension is used together with the TYPO3 Extension sr_freecap, it is possible to bypass the catcha in the registration form.


An updated version 5.1.0 is available from the TYPO3 extension manager and at https://extensions.typo3.org/extension/download/sr_feuser_register/5.1.0/zip/
Users of the extension are advised to update the extension as soon as possible. 


Thanks to Johannes Hahn who discovered and reported the vulnerability. 

General Advice

Follow the recommendations that are given in the TYPO3 Security Guide. Please subscribe to the typo3-announce mailing list.