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Vulnerabilities

Vulnerability · CVE-2026-6403

The Quick Playground plugin for WordPress is vulnerable to Path Traversal in versions up to and including 1.3.3.

Published May 15, 2026 · catalog updated Jun 17, 2026 · The Quick Playground plugin

Check if you run it

No confirmed exploitation is on record for CVE-2026-6403. EPSS is 1.20%. Act only if a listed version of The Quick Playground plugin is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (The Quick Playground plugin).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.20%
Remediation
Version ranges on file
Affected products
stated named in the record

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated named in the record<= 1.3.3

How to fix CVE-2026-6403

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-6403. EPSS is 1.20%. Act only if a listed version of The Quick Playground plugin is installed.

Which versions are affected?

Compare what you have installed with named in the record <= 1.3.3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-22: Path Traversal. EPSS 1.20%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 15, 2026 · NIST NVD

    Detected

    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 trig

  2. Jun 17, 2026 · NIST NVD

    Updated

    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 trig

Sources

  • CVE.orgVulnerability recordCVE-2026-6403

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-6403

    30-day exploitation probability 1.2%

    first.org
  • NIST NVDVulnerability recordCVE-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 direc

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.