How severe is CVE-2023-23596?

CVE-2023-23596 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-23596 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 15% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-23596?

CVE-2023-23596 affects Jc21 Nginx Proxy Manager. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-23596?

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-2023-23596 published?

CVE-2023-23596 was published on 2023-01-20 and last updated on 2026-06-17.

CVE-2023-23596

CVE-2023-23596 is a high-severity vulnerability in Jc21 Nginx Proxy Manager with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 15% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 15% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Jc21 Nginx Proxy Manager
Published: 2023-01-20
Last modified: 2026-06-17

Description

jc21 NGINX Proxy Manager through 2.9.19 allows OS command injection. When creating an access list, the backend builds an htpasswd file with crafted username and/or password input that is concatenated without any validation, and is directly passed to the exec command, potentially allowing an authenticated attacker to execute arbitrary commands on the system. NOTE: this is not part of any NGINX software shipped by F5.

Frequently asked questions

What is CVE-2023-23596?: jc21 NGINX Proxy Manager through 2.9.19 allows OS command injection. When creating an access list, the backend builds an htpasswd file with crafted username and/or password input that is concatenated without any validation, and is directly passed to the exec command, potentially allowing an authenticated attacker to execute arbitrary commands on the system. NOTE: this is not part of any NGINX software shipped by F5.
How severe is CVE-2023-23596?: CVE-2023-23596 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-23596 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 15% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-23596?: CVE-2023-23596 affects Jc21 Nginx Proxy Manager. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-23596?: 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-2023-23596 published?: CVE-2023-23596 was published on 2023-01-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jc21:nginx_proxy_manager:*:*:*:*:*:*:*:*

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