What’s Vulnerable › Vulnerabilities

CVE-2021-24245: Stop Spammers < 2021.9 - Reflected Cross-Site Scripting (XSS)

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-06 · updated 2026-06-17
• Weakness: CWE-79

Description

The Stop Spammers WordPress plugin before 2021.9 did not escape user input when blocking requests (such as matching a spam word), outputting it in an attribute after sanitising it to remove HTML tags, which is not sufficient and lead to a reflected Cross-Site Scripting issue.

Affected products

• Stop Spammers Security | Block Spam Users, Comments, Forms: before 2021.9 — fixed in 2021.9

How to fix

Upgrade to a fixed version: Stop Spammers Security | Block Spam Users, Comments, Forms 2021.9. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/162623/WordPress-Stop-Spammers-2021.8-Cross-Site-Scripting.html
• https://wpscan.com/vulnerability/5e7accd6-08dc-4c6e-9d19-73e2d7e97735
• http://packetstormsecurity.com/files/162623/WordPress-Stop-Spammers-2021.8-Cross-Site-Scripting.html
• https://wpscan.com/vulnerability/5e7accd6-08dc-4c6e-9d19-73e2d7e97735

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