CVE-2022-4670: PDF.js Viewer < 2.1.8 - Contributor+ Stored XSS via Shortcode

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-02-06 · updated 2026-06-17

Description

The PDF.js Viewer WordPress plugin before 2.1.8 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks.

Affected products

PDF.js Viewer: before 2.1.8 — fixed in 2.1.8

How to fix

Upgrade to a fixed version: PDF.js Viewer 2.1.8. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/2a67c290-2a27-44fe-95ae-2d427e9d7548
https://wpscan.com/vulnerability/2a67c290-2a27-44fe-95ae-2d427e9d7548

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