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AUSCERT External Security Bulletin Redistribution
Drupal - reCAPTCHA v3 - Critical - Access bypass (SA-CONTRIB-2020-019)
14 May 2020
AusCERT Security Bulletin Summary
Product: reCAPTCHA v3 module for Drupal
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Unauthorised Access -- Remote/Unauthenticated
Comment: This advisory references vulnerabilities in products which run on
platforms other than Drupal. It is recommended that administrators
running reCAPTCHA v3 module for Drupal check for an updated version
of the software for their operating system.
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reCAPTCHA v3 - Critical - Access bypass - SA-CONTRIB-2020-019
Project: reCAPTCHA v3
Critical 18/25 AC:None/A:None/CI:Some/II:Some/E:Theoretical/TD:All
Vulnerability: Access bypass
The reCaptcha v3 module enables you to protect your forms using the Google
If the reCaptcha v3 challenge succeeds, all the other form validations are
bypassed. This makes it possible for attackers to submit invalid or incomplete
This vulnerability only affects forms that are protected by reCaptcha v3 and
have server side validation steps (e.g required field or custom validation
Install the latest version:
o If you use the reCAPTCHA v3 module for Drupal 8.x, upgrade to reCAPTCHA v3
Also see the reCAPTCHA v3 project page.
o Martijn Vermeulen
o Denis V*****
o Majid Ali Khan
o Greg Knaddison of the Drupal Security Team
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