WordPress plugin

PDF Light Viewer <= 1.4.11 — Authenticated Command Injection

CVE-2021-24684Published Sep 15, 2021 · Updated Nov 13, 2026

Affected: ≤1.4.11Update to 1.4.12 or newer

All remediation steps

Watch plugin

Severity

Critical9.9

CVSS

9.9

CVSS 3.1 · CNA (Wordfence)

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

What does this vector mean?

AV:N Attack vector: Network
AC:L Attack complexity: Low
PR:L Privileges required: Low
UI:N User interaction: None
S:C Scope: Changed
C:H Confidentiality: High
I:H Integrity: High
A:H Availability: High

Weakness

CWE-78 Improper Neutralization of Special Elements used in an OS Command

Required access

Unknown

Exploit prediction (EPSS)

No score

CISA KEV

Not listed

On this page7

Am I affected?

WordPress PDF Light Viewer Plugin pdf-light-viewer

Affected≤ 1.4.11
Patched in1.4.12

You are affected if you run ≤ 1.4.11. Version 1.4.12 and later are not affected by this issue.

Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under WordPress PDF Light Viewer Plugin.
No admin access? Run a passive check of your site. It reads public files only.

What to do

Update to version 1.4.12, or a newer patched version
Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
Watch WordPress PDF Light Viewer Plugin to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to apple502j.

The WordPress PDF Light Viewer Plugin WordPress plugin before 1.4.12 allows users with Author roles to execute arbitrary OS command on the server via OS Command Injection when invoking Ghostscript.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

Advisorywordfence.com

Timeline

Sep 15, 2021
CVE published
Severity critical, CVSS 9.9
Nov 13, 2026
Record last updated

Sources & licenses

Wordfence record

Vulnerability data: Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
CVE® identifiers: Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE: National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.

How we use these sources