What’s Vulnerable › Vulnerabilities

CVE-2021-39349: Author Bio Box <= 3.3.1 Authenticated Stored Cross-Site Scripting

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-10-15 · updated 2026-06-17
• Weakness: CWE-79

Description

The Author Bio Box WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient input validation and sanitization via several parameters found in the ~/includes/admin/class-author-bio-box-admin.php file which allowed attackers with administrative user access to inject arbitrary web scripts, in versions up to and including 3.3.1. This affects multi-site installations where unfiltered_html is disabled for administrators, and sites where unfiltered_html is disabled.

Affected products

• Author Bio Box: through 3.3.1

References

• https://github.com/BigTiger2020/word-press/blob/main/Author%20Bio%20Box.md
• https://plugins.trac.wordpress.org/changeset/2613798/author-bio-box/tags/3.3.2/includes/admin/class-author-bio-box-admin.php
• https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39349
• https://github.com/BigTiger2020/word-press/blob/main/Author%20Bio%20Box.md
• https://plugins.trac.wordpress.org/changeset/2613798/author-bio-box/tags/3.3.2/includes/admin/class-author-bio-box-admin.php
• https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39349

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