CVE-2021-4339

uListing <= 1.6.6 - Unauthenticated Information Disclosure

7.5 High

The uListing plugin for WordPress is vulnerable to authorization bypass due to a missing capability check in the "ulisting/includes/route.php" file on the /1/api/ulisting-user/search REST-API route in versions up to, and including, 1.6.6. This makes it possible for unauthenticated attackers to retrieve the list of all users and their email address in the database.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: None
Availability: None

Exploit likelihood

0.95%Up 0.9 points since Jun 7, 2023

What each source reports

CVE List Score used 7.5

uListing <= 1.6.6 - Unauthenticated Information Disclosure

Record: CVE-2021-4339
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness: CWE-862
Updated: 2026-11-02

EUVDEUVD-2021-34166 7.5

Record: EUVD-2021-34166
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-99h6-wmg5-777v 7.5

The uListing plugin for WordPress is vulnerable to authorization bypass due to a missing...

Record: GHSA-99h6-wmg5-777v
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness: CWE-862
Updated: 2026-11-02

NVD 7.5

Record: CVE-2021-4339
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-862
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-4339 is a high vulnerability (CVSS 7.5) in Stylemixthemes Ulisting, published June 7, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.95%, the 61st percentile. No source names a fixed version.