CVE-2020-35590

CRITICAL

limit-login-attempts-reloaded < 2.17.4 - Rate Limit Bypass via X-Forwarded-For Header Spoofing

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2020-35590. PoCs published by N4nj0.

AI-analyzed exploit summary This repository contains a functional exploit for CVE-2020-35590, which bypasses login rate limits in the WordPress plugin 'Limit Login Attempts Reloaded' by manipulating HTTP headers like X-Forwarded-For. The exploit demonstrates how unvalidated headers can defeat the plugin's brute-force protection.

Description

LimitLoginAttempts.php in the limit-login-attempts-reloaded plugin before 2.17.4 for WordPress allows a bypass of (per IP address) rate limits because the X-Forwarded-For header can be forged. When the plugin is configured to accept an arbitrary header for the client source IP address, a malicious user is not limited to perform a brute force attack, because the client IP header accepts any arbitrary string. When randomizing the header input, the login count does not ever reach the maximum allowed retries.

Exploits (1)

nomisec WORKING POC 8 stars
by N4nj0 · poc
https://github.com/N4nj0/CVE-2020-35590

This repository contains a functional exploit for CVE-2020-35590, which bypasses login rate limits in the WordPress plugin 'Limit Login Attempts Reloaded' by manipulating HTTP headers like X-Forwarded-For. The exploit demonstrates how unvalidated headers can defeat the plugin's brute-force protection.

Classification
Working Poc 95%
Attack Type
Auth Bypass
Complexity
Trivial
Reliability
Reliable
Target: WordPress Plugin Limit Login Attempts Reloaded 2.13.0
No auth needed
Prerequisites: WordPress site with vulnerable plugin installed · Ability to send HTTP requests with custom headers
MITRE ATT&CK
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (2)

Core 2
Core References
Product, Third Party Advisory x_refsource_misc
https://wordpress.org/plugins/limit-login-attempts-reloaded/#developers

Scores

CVSS v3 9.8
EPSS 0.0435
EPSS Percentile 89.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-307
Status published
Products (1)
limitloginattempts/limit_login_attempts_reloaded < 2.17.4
Published Dec 21, 2020
Tracked Since Feb 18, 2026