How severe is CVE-2021-36879?

CVE-2021-36879 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-36879 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-36879?

CVE-2021-36879 affects Stylemixthemes Ulisting. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-36879?

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

When was CVE-2021-36879 published?

CVE-2021-36879 was published on 2021-09-27 and last updated on 2026-06-17.

CVE-2021-36879

CVE-2021-36879 is a critical-severity vulnerability in Stylemixthemes Ulisting with a CVSS 3.x base score of 9.8. 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-264.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Stylemixthemes Ulisting
Published: 2021-09-27
Last modified: 2026-06-17

Description

Unauthenticated Privilege Escalation vulnerability in WordPress uListing plugin (versions <= 2.0.5). Possible if WordPress configuration allows user registration.

Frequently asked questions

What is CVE-2021-36879?: Unauthenticated Privilege Escalation vulnerability in WordPress uListing plugin (versions <= 2.0.5). Possible if WordPress configuration allows user registration.
How severe is CVE-2021-36879?: CVE-2021-36879 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-36879 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-36879?: CVE-2021-36879 affects Stylemixthemes Ulisting. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-36879?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-36879 published?: CVE-2021-36879 was published on 2021-09-27 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-2021-4340 — 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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Other CWE-264 (Permissions, Privileges, and Access Controls) vulnerabilities

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