What’s Vulnerable › Vulnerabilities

CVE-2021-24657: Limit Login Attempts < 4.0.50 - Unauthenticated Stored Cross-Site Scripting

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-09-20 · updated 2026-06-17
• Weakness: CWE-79

Description

The Limit Login Attempts WordPress plugin before 4.0.50 does not escape the IP addresses (which can be controlled by attacker via headers such as X-Forwarded-For) of attempted logins before outputting them in the reports table, leading to an Unauthenticated Stored Cross-Site Scripting issue.

Affected products

• Limit Login Attempts: before 4.0.50 — fixed in 4.0.50

How to fix

Upgrade to a fixed version: Limit Login Attempts 4.0.50. Check the vendor advisory for mitigations.

References

• https://wpscan.com/vulnerability/c789ca04-d88c-4789-8be1-812888f0c8f8
• https://wpscan.com/vulnerability/c789ca04-d88c-4789-8be1-812888f0c8f8

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