CVE-2021-4416: The wp-mpdf plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including,

Q: How do I fix CVE-2021-4416?

wp-mpdf: upgrade to newer than 3.5.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-4416 being exploited?

CVE-2021-4416 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-4416 affect?

CVE-2021-4416 affects wp-mpdf. Severity is medium (CVSS 4.3). 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 una

Q: How urgent is CVE-2021-4416?

Priority 23/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADE

CVE-2021-4416 is a medium-severity flaw (CVSS 4.3) affecting wp-mpdf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-352
Published	2023-07-12
Last modified	2026-06-17

Publisher (CNA): Wordfence · Vendor: wp-mpdf project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-07-12 04:15 UTCPublished CVE record published
2026-06-17 04:19 UTCUpdated Record last modified

wp-mpdf project wp-mpdf UPGRADE

Affected: <= 3.5.1

Fixed in: newer than 3.5.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy wp-mpdf || rpm -q wp-mpdf || wp-mpdf --version

2. UPGRADE to newer than 3.5.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade wp-mpdf

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade wp-mpdf

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-4416?

wp-mpdf: upgrade to newer than 3.5.1. Exact commands for each OS are on this page.

Is CVE-2021-4416 being exploited?

CVE-2021-4416 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-4416 affect?

CVE-2021-4416 affects wp-mpdf. Severity is medium (CVSS 4.3). 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 una

How urgent is CVE-2021-4416?

Priority 23/100. No elevated risk signals yet.

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2024-27962 HIGH 7.1 UPGRADE Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Florian

References

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