CVE-2025-50579: nginx proxy — Fix

Description

A CORS misconfiguration in Nginx Proxy Manager v2.12.3 allows unauthorized domains to access sensitive data, particularly JWT tokens, due to improper validation of the Origin header. This misconfiguration enables attackers to intercept tokens using a simple browser script and exfiltrate them to a remote attacker-controlled server, potentially leading to unauthorized actions within the application.

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CVSS v3.1 Score

5.3

MEDIUM

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

Weakness Type (CWE)

CWE-1259 CWE-1259

Affected Products

Vendor	Product	Versions
jc21	nginx_proxy_manager	All

References

Advisories & Patches

https://github.com/NginxProxyManager/nginx-proxy-manager/issues/4509

Other References

https://github.com/NginxProxyManager/nginx-proxy-manager

Frequently Asked Questions

What is CVE-2025-50579? +

A CORS misconfiguration in Nginx Proxy Manager v2.12.3 allows unauthorized domains to access sensitive data, particularly JWT tokens, due to improper validation of the Origin header. This misconfiguration enables attackers to intercept tokens using a simple browser script and exfiltrate them to a remote attacker-controlled server, potentially leading to unauthorized actions within the application. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-50579? +

CVE-2025-50579 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-50579? +

CVE-2025-50579 affects products from jc21, specifically: nginx_proxy_manager. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-50579? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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