WordPress Core < 5.1.1 - Cross-Site Request Forgery to Cross-Site Scripting via Comments

Cross-Site Request Forgery (CSRF)
CVE CVE-2019-9787
CVSS Critical (9.6)
Publicly Published April 12, 2019
Last Updated January 22, 2024
Researcher Simon Scannell
Description

WordPress before 5.1.1 does not properly filter comment content, leading to Remote Code Execution by unauthenticated users in a default configuration. This occurs because CSRF protection is mishandled, and because Search Engine Optimization of A elements is performed incorrectly, leading to XSS. The XSS results in administrative access, which allows arbitrary changes to .php files. This is related to wp-admin/includes/ajax-actions.php and wp-includes/comment.php.

References

1 affected software package

Software Type Core
Software Slug wordpress (view on wordpress.org)
Patched? Yes
Affected Version
  • <= 3.7
  • 3.7 - 3.7.28
  • 3.8 - 3.8.28
  • 3.9 - 3.9.26
  • 4.0 - 4.0.25
  • 4.1 - 4.1.25
  • 4.2 - 4.2.22
  • 4.3 - 4.3.18
  • 4.4 - 4.4.17
  • 4.5 - 4.5.16
  • 4.6 - 4.6.13
  • 4.7 - 4.7.12
  • 4.8 - 4.8.8
  • 4.9 - 4.9.9
  • 5.0 - 5.0.3
  • 5.1 - 5.1
Patched Version
  • 3.7.29
  • 3.8.29
  • 3.9.27
  • 4.0.26
  • 4.1.26
  • 4.2.23
  • 4.3.19
  • 4.4.18
  • 4.5.17
  • 4.6.14
  • 4.7.13
  • 4.8.9
  • 4.9.10
  • 5.0.4
  • 5.1.1
This record contains material that is subject to copyright

Copyright 2012-2026 Defiant Inc.
License: Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy. License Detail.