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Vulnerability record · CVE-2023-23596 · published 20 January 2023

CVE-2023-23596: Jc21 nginx proxy manager os command injection vulnerability

Jc21 · Nginx Proxy Manager

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.

8.8 CVSS 3.1 High EPSS 15% · top 3.4% CWE-78 · OS command injection
8.8CVSS 3.1 base score
15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 4 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://advisory.dw1.io/57 ExploitThird Party Advisory
https://github.com/NginxProxyManager/nginx-proxy-manager/blob/4f10d129c20cc82494b95cc94b97f859dbd4b54d/backend/internal/ ExploitThird Party Advisory
https://advisory.dw1.io/57 ExploitThird Party Advisory
https://github.com/NginxProxyManager/nginx-proxy-manager/blob/4f10d129c20cc82494b95cc94b97f859dbd4b54d/backend/internal/ ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2023-23596), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.