CVE-2021-4416 json
wp-mpdf <= 3.5.1 - Cross-Site Request Forgery Bypass
published 2023-07-12 3 y ago modified 2026-06-17 4 mo ago also EUVD-2021-34243
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 32%
- public exploits
- 0
- none known
Summary
The wp-mpdf plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 3.5.1. This is due to missing or incorrect nonce validation on the mpdf_admin_savepost() function. This makes it possible for unauthenticated attackers to save post data via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 y ago
Exploit prediction
0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N |
Affected products
- fkrauthan wp-mpdf
Classification
- Weakness
-
- CWE-352 Cross-Site Request Forgery
- Technology feeds
References
-
plugins.trac.wordpress.org
/changeset/2549363/wp-mpdf/trunk/wp-mpdf.php
patch
-
wordfence.com
/threat-intel/vulnerabilities/id/c47386ee-25c8-4a77-92e8-5a82afc9c826?source=cve
third-party-advisory
-
blog.nintechnet.com
/25-wordpress-plugins-vulnerable-to-csrf-attacks/
third-party-advisory
-
blog.nintechnet.com
/more-wordpress-plugins-and-themes-vulnerable-to-csrf-attacks/
third-party-advisory
-
blog.nintechnet.com
/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-3/
third-party-advisory
-
blog.nintechnet.com
/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-2/
third-party-advisory
-
blog.nintechnet.com
/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-1/
third-party-advisory
-
blog.nintechnet.com
/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-5/
third-party-advisory
-
blog.nintechnet.com
/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-4/
third-party-advisory
Sources
- CVE List CVE-2021-4416
- NVD CVE-2021-4416
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.