What’s Vulnerable › Vulnerabilities

CVE-2021-24574: Simple Banner < 2.10.4 - Authenticated Stored XSS

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-08-23 · updated 2026-06-17
• Weakness: CWE-79

Description

The Simple Banner WordPress plugin before 2.10.4 does not sanitise and escape one of its settings, allowing high privilege users such as admin to use Cross-Site Scripting payload even when the unfiltered_html capability is disallowed.

Affected products

• Simple Banner: before 2.10.4 — fixed in 2.10.4

How to fix

Upgrade to a fixed version: Simple Banner 2.10.4. Check the vendor advisory for mitigations.

References

• https://plugins.trac.wordpress.org/changeset/2571047/
• https://wpscan.com/vulnerability/9adf7022-5108-43b7-bf0e-a42593185b74
• https://plugins.trac.wordpress.org/changeset/2571047/
• https://wpscan.com/vulnerability/9adf7022-5108-43b7-bf0e-a42593185b74

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