HOMEVULNERABILITIESCVE-2026-6403
HIGH

CVE-2026-6403

CWE-22Published: May 15, 2026· Updated: May 15, 2026

7.5
CVSS v3.1
EPSS:0.27%probability of exploitation in 30 daysPercentile:50.2th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-6403 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

Mentioned vendors (from description):
WordPress
CPE data not yet available in NVD for this CVE.

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

All References (11)

→
https://plugins.trac.wordpress.org/browser/quick-playground/tags/1.3.1/api.php#L62
→
https://plugins.trac.wordpress.org/browser/quick-playground/tags/1.3.1/api.php#L631
→
https://plugins.trac.wordpress.org/browser/quick-playground/tags/1.3.1/utility.php#L162
→
https://plugins.trac.wordpress.org/browser/quick-playground/tags/1.3.1/utility.php#L248
→
https://plugins.trac.wordpress.org/browser/quick-playground/trunk/api.php#L62
→
https://plugins.trac.wordpress.org/browser/quick-playground/trunk/api.php#L631
→
https://plugins.trac.wordpress.org/browser/quick-playground/trunk/utility.php#L162
→
https://plugins.trac.wordpress.org/browser/quick-playground/trunk/utility.php#L248
→
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3514238%40quick-playground&new=3514238%40quick-playground&sfp_email=&sfph_mail=
→
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3523317%40quick-playground&new=3523317%40quick-playground&sfp_email=&sfph_mail=
→
https://www.wordfence.com/threat-intel/vulnerabilities/id/a39dccb6-b635-44af-b0e0-c3010b719773?source=cve

Quick Facts

CVE IDCVE-2026-6403
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-22
CISA KEVNo
EPSS (30d)0.27%
PublishedMay 15, 2026

Related CVEs (CWE-22)

CVE-2026-36767
10.0
CVE-2026-48282
KEV10.0
CVE-2026-11429
10.0
CVE-2026-39861
10.0
CVE-2025-69770
10.0
CVE-2026-54917
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-6403 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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