CVE-2021-39343

MEDIUM 4.8CVE-2021-39343 · Published 19/10/2021 · updated 17/06/2026

In short

CVE-2021-39343 is a MEDIUM (CVSS 4.8) vulnerability affecting mpl-publisher (mpl-publisher).
Chance of exploitation in the next 30 days (EPSS): 1.0%, higher than 64.1% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
mpl-publisher mpl-publisher	`≤ 1.30.2`	No fix yet

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.

References

BigTiger2020/word-press · Exploit
plugins.trac.wordpress.org/browser/mpl-publisher/trunk/libs/PublisherController.php · Exploit
wordfence.com/vulnerability-advisories · Third Party Advisory

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