Incorrect authorization in NGINX Open Source and NGINX Plus - CVE-2026-28755
Published: March 25, 2026
Vulnerability identifier: #VU124470
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green
CVE-ID: CVE-2026-28755
CWE-ID: CWE-863
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: F5 Networks
Affected software:
NGINX Open Source
NGINX Plus
NGINX Open Source
NGINX Plus
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to improper handling of revoked certificates in the ngx_stream_ssl_module module when configured with the ssl_verify_client on and ssl_ocsp on directives. A remote attacker can bypass authorization checks and access application data with a revoked certificate.
How to mitigate CVE-2026-28755
Install updates from vendor's website.