PT-2021-22550 · WordPress · Mpl-Publisher

Published 2021-10-19 · Updated 2025-04-25 · CVE-2021-39343

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions: MPL-Publisher WordPress plugin versions up to and including 1.30.2

Description: The issue arises from insufficient input validation and sanitization via several parameters found in the ~/libs/PublisherController.php file, allowing attackers with administrative user access to inject arbitrary web scripts. This affects multi-site installations where unfiltered html is disabled for administrators, and sites where unfiltered html is disabled.

Recommendations: For versions up to and including 1.30.2, update to a version that includes the necessary input validation and sanitization fixes to prevent Stored Cross-Site Scripting. As a temporary workaround, consider restricting administrative access to trusted users only, and enable unfiltered html for administrators if possible, until a patch is available.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2021-39343

Affected Products

Mpl-Publisher

References · 7

• 🔥 https://github.com/BigTiger2020/word-press/blob/main/MPL-Publisher.md · Exploit
• 🔥 https://plugins.trac.wordpress.org/browser/mpl-publisher/trunk/libs/PublisherController.php#L35 · Exploit
• https://osv.dev/vulnerability/CVE-2021-39343 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-39343 · Security Note
• https://t.me/cibsecurity/30793 · Telegram Post
• https://t.me/cvenotify/119847 · Telegram Post
• https://wordfence.com/vulnerability-advisories/#CVE-2021-39343 · Note