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TI-2021-16710 Aliases CVE-2021-39343GHSA-2rvj-j9cf-63c3

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

Priority LOW 27CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01037 64th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MPL-PublisherMPL-Publisher1.30.2 – 1.30.2—No fix listedCNA
  • MPL-Publisher VendorMPL-Publisher Affected 1.30.2 – 1.30.2 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mpl-publisher:mpl-publisher:*:*:*:*:*:wordpress:*:*up to 1.30.2VulnerableMPL-Publisher
  • cpe:2.3:a:mpl-publisher:mpl-publisher:*:*:*:*:*:wordpress:*:* Versions up to 1.30.2 Vulnerable ·MPL-Publisher

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-39343
  2. 2026-10-03 Alias added: GHSA-2rvj-j9cf-63c3

References

Exploit 2

Advisory 1

  • TI-2025-28978 WordPress MPL-Publisher plugin <= 2.18.0 - Cross Site Scripting (XSS) Vulnerability CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences