What is CVE-2026-4073?

CVE-2026-4073 is a medium-severity vulnerability in Dougblackjr Pdfl.io, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-04-08.

How severe is CVE-2026-4073?

Medium severity. CVSS v3 base score is 6.4 out of 10.

XSS in Dougblackjr Pdfl.io

CVE-2026-4073

The pdfl.io plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'pdflio' shortcode in all versions up to, and including, 1.0.5. This is due to insufficient input sanitization and output escaping on the 'text' shortcode attribute. The output_shortcode() function directly concatenates the user-supplied $text variable into HTML output without applying esc_html() or any other escaping function. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (22.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

Dougblackjr Pdfl.io — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-4073?: CVE-2026-4073 is a medium-severity vulnerability in Dougblackjr Pdfl.io, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-04-08.
How severe is CVE-2026-4073?: Medium severity. CVSS v3 base score is 6.4 out of 10.