What’s Vulnerable › Vulnerabilities

CVE-2021-39343: MPL-Publisher – Self-publish your book & ebook <= 1.30.2 Authenticated Stored Cross-Site Scripting

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-10-19 · updated 2026-06-17
• Weakness: CWE-79

Description

The MPL-Publisher WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient input validation and sanitization via several parameters found in the ~/libs/PublisherController.php file which allowed attackers with administrative user access to inject arbitrary web scripts, in versions up to and including 1.30.2. This affects multi-site installations where unfiltered_html is disabled for administrators, and sites where unfiltered_html is disabled.

Affected products

• ferranfg MPL-Publisher: through 1.30.2

References

• https://github.com/BigTiger2020/word-press/blob/main/MPL-Publisher.md
• https://plugins.trac.wordpress.org/browser/mpl-publisher/trunk/libs/PublisherController.php#L35
• https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39343
• https://github.com/BigTiger2020/word-press/blob/main/MPL-Publisher.md
• https://plugins.trac.wordpress.org/browser/mpl-publisher/trunk/libs/PublisherController.php#L35
• https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39343

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