Path Traversal in Davidfcarr Quick Playground

CVE-2026-6403

The Quick Playground plugin for WordPress is vulnerable to Path Traversal in versions up to and including 1.3.3. This is due to insufficient path validation in the qckply_zip_theme() function, which appends a user-controlled 'stylesheet' parameter directly to the theme root directory path without sanitizing directory traversal sequences. This makes it possible for unauthenticated attackers to trigger the creation of a ZIP archive containing arbitrary files from the server's filesystem — including wp-config.

Vulnerability class: Path Traversal (Directory Traversal)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.012 (67.1th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-6403: held from 0.008 to 0.012.

EPSS over last 30 days · oldest: 0.008 · newest: 0.012 · change: +0.004

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-6403?
CVE-2026-6403 is a high-severity vulnerability in Davidfcarr Quick Playground, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-05-15.
How severe is CVE-2026-6403?
High severity. CVSS v3 base score is 7.5 out of 10.