Nagios CSRF Bypass via Double-Submit Cookie Before 4.5.14/2026R1.7
CVE-2026-48551 Published on August 12, 2026
Nagios Core / XI CSRF Protection Bypass via Double-Submit Cookie
Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 contain a cross-site request forgery protection bypass via a self-supplied double-submit cookie. An attacker can supply matching cookie and request parameter values to bypass CSRF protection, enabling unauthenticated attackers to run commands as authorized users via malicious links.
Vulnerability Analysis
CVE-2026-48551 can be exploited with network access. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is a Session Riding Vulnerability?
The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request. When a web server is designed to receive a request from a client without any mechanism for verifying that it was intentionally sent, then it might be possible for an attacker to trick a client into making an unintentional request to the web server which will be treated as an authentic request. This can be done via a URL, image load, XMLHttpRequest, etc. and can result in exposure of data or unintended code execution.
CVE-2026-48551 has been classified to as a Session Riding vulnerability or weakness.
Products Associated with CVE-2026-48551
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Affected Versions
Nagios Enterprises, LLC. Nagios Core:- Before 4.5.14 is affected.
- Before 2026R1.7 is affected.