CVE-2023-23596

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2023-01-20. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 15%CVSS: 8.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
8.8
EG Score
8.8(medium)
EG Risk
56(Track*)
EG Risk 56/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
15%
EPSS %ILE
97%
KEV
Not listed

Published

January 20, 2023

Last Modified

April 3, 2025

Advisory Details (2)

Auto-updated Aug 15, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

nginx-proxy-manager/backend/internal/access-list.js at 4f10d129c20cc82494b95cc94b97f859dbd4b54d · NginxProxyManager/nginx-proxy-manager · GitHub

https://github.com/NginxProxyManager/nginx-proxy-manager/blob/4f10d129c20cc82494b95cc94b97f859dbd4b54d/backend/internal/access-list.js#L510
generic🟡 PoC Available

CVE-2023-23596: OS Command Injection in Nginx Proxy Manager - dw1's Advisory

https://advisory.dw1.io/57

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 29× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 149 total refreshes for this CVE.

  1. 2026-09-08 21:57 UTCEPSS rescore
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  23. 2026-07-23 02:19 UTCEG score recompute
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Frequently asked(5)

What is CVE-2023-23596?
CVE-2023-23596 is a high vulnerability published on January 20, 2023. 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…
When was CVE-2023-23596 disclosed?
CVE-2023-23596 was first published in the National Vulnerability Database on January 20, 2023, with the most recent update on April 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-23596 actively exploited?
CVE-2023-23596 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 15% probability of exploitation in the next 30 days, which ranks it in the top 3.5% of all scored CVEs.
What is the CVSS score of CVE-2023-23596?
CVE-2023-23596 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2023-23596?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-23596, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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