CVE-2023-23596

Name: CVE-2023-23596
Creator: NVD / NIST
Published: 2023-01-20T08:15:12.67+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 15.20%

Last modified Jun 17, 2026

CVE-2023-23596 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 15.20% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

15.20%

96.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Jc21	Nginx Proxy Manager	<= 2.9.19

References

https://advisory.dw1.io/57Exploit, Third Party Advisory
https://github.com/NginxProxyManager/nginx-proxy-manager/blob/4f10d129c20cc82494b95cc94b97f859dbd4b54d/backend/internal/access-list.js#L510Exploit, Third Party Advisory
https://advisory.dw1.io/57Exploit, Third Party Advisory
https://github.com/NginxProxyManager/nginx-proxy-manager/blob/4f10d129c20cc82494b95cc94b97f859dbd4b54d/backend/internal/access-list.js#L510Exploit, Third Party Advisory

Timeline

Published: Jan 20, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-23596?

How severe is CVE-2023-23596?

CVE-2023-23596 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 15.20% probability of exploitation in the next 30 days.

How do I fix CVE-2023-23596?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-23596?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST