How severe is CVE-2021-4339?

CVE-2021-4339 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-4339 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-4339?

CVE-2021-4339 affects Stylemixthemes Ulisting. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-4339?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-4339 published?

CVE-2021-4339 was published on 2023-06-07 and last updated on 2026-06-17.

CVE-2021-4339

CVE-2021-4339 is a high-severity vulnerability in Stylemixthemes Ulisting with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (57th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Stylemixthemes Ulisting
Published: 2023-06-07
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-4339?: 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.
How severe is CVE-2021-4339?: CVE-2021-4339 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-4339 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-4339?: CVE-2021-4339 affects Stylemixthemes Ulisting. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-4339?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-4339 published?: CVE-2021-4339 was published on 2023-06-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:stylemixthemes:ulisting:*:*:*:*:*:wordpress:*:*

More vulnerabilities in Stylemixthemes Ulisting

CVE-2021-4381 — Critical (CVSS 9.8): The uListing plugin for WordPress is vulnerable to authorization bypass via wp_route due to missing capability checks,…
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CVE-2021-4346 — Critical (CVSS 9.8): The uListing plugin for WordPress is vulnerable to Unauthenticated Arbitrary Account Changes in versions up to, and…
CVE-2021-4343 — Critical (CVSS 9.8): The Unauthenticated Account Creation plugin for WordPress is vulnerable to Unauthenticated Account Creation in versions…
CVE-2021-4341 — Critical (CVSS 9.8): The uListing plugin for WordPress is vulnerable to authorization bypass via Ajax due to missing capability checks,…
CVE-2021-4340 — Critical (CVSS 9.8): The uListing plugin for WordPress is vulnerable to generic SQL Injection via the ‘listing_id’ parameter in versions…

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