What the vulnerability does
01Description
The OOPSpam Anti-Spam: Spam Protection for WordPress Forms & Comments (No CAPTCHA) plugin for WordPress is vulnerable to IP Header Spoofing in all versions up to, and including, 1.2.53. This is due to the plugin trusting client-controlled forwarded headers (such as CF-Connecting-IP, X-Forwarded-For, and others) without verifying that those headers originate from legitimate, trusted proxies. This makes it possible for unauthenticated attackers to spoof their IP address and bypass IP-based security controls, including blocked IP lists and rate limiting protections, by sending arbitrary HTTP headers with their requests.
Explanation of Vulnerability in Simple Terms
02Summary
The OOPSpam Anti-Spam plugin for WordPress contains an integrity vulnerability affecting versions up to 1.2.53. An attacker on the network can modify data or content without authentication or user interaction. The vulnerability has low integrity impact and does not affect confidentiality or availability. Site administrators should update to a version newer than 1.2.53.
What an attacker can do
03Attacker Capabilities
Modify form submissions, comments, or plugin data without authentication.
Potential impact on your site
04Site Impact
Spam protection may be bypassed or form/comment data altered by attackers.
Conditions required to exploit
05Prerequisites
Network access only; no authentication or user interaction required.
Key dates
06Disclosure timeline
October 31, 2025
CVE published
April 8, 2026
Record updated
