Nagios Core
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By the Year
In 2026 there have been 5 vulnerabilities in Nagios Core with an average score of 6.3 out of ten. Nagios Core did not have any published security vulnerabilities last year. That is, 5 more vulnerabilities have already been reported in 2026 as compared to last year.
| Year | Vulnerabilities | Average Score |
|---|---|---|
| 2026 | 5 | 6.34 |
| 2025 | 0 | 0.00 |
| 2024 | 0 | 0.00 |
| 2023 | 0 | 0.00 |
| 2022 | 0 | 0.00 |
| 2021 | 0 | 0.00 |
| 2020 | 1 | 8.80 |
| 2019 | 0 | 0.00 |
| 2018 | 3 | 5.47 |
It may take a day or so for new Nagios Core vulnerabilities to show up in the stats or in the list of recent security vulnerabilities. Additionally vulnerabilities may be tagged under a different product or component name.
Recent Nagios Core Security Vulnerabilities
Nagios Core <4.5.14 RCE via unfiltered NOTIFICATION macro in com_data
CVE-2026-48554
7.7 - High
- August 12, 2026
Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to authenticated remote code execution via unfiltered NOTIFICATION-family macro substitution through the com_data parameter. When a notification command references $NOTIFICATIONCOMMENT$ or $NOTIFICATIONAUTHOR$ in a shell-reachable position, authenticated UI users can run arbitrary commands as the nagios user. Exploitation requires a non-default configuration in which a notification command references these macros in a shell-executed command line.
Shell injection
Nagios Core <4.5.13 & XI <2026R1.5: Auth RCE via NRDP macro injection
CVE-2026-48553
7.7 - High
- August 12, 2026
Nagios Core before 4.5.13 and Nagios XI before 2026R1.5 are vulnerable to authenticated remote code execution via custom-variable macro injection through the Nagios Remote Data Processor (NRDP). When a custom variable defined on a host, service, or contact is referenced in a shell-executed command line, an authenticated attacker with NRDP access can inject OS commands through the macro value. Exploitation requires a non-default configuration in which a custom variable is defined and referenced in a shell-executed command.
Shell injection
Nagios Core/ XI DOM-based XSS via jsonquery.js (<=4.5.14 & <=2026R1.7)
CVE-2026-48552
5.1 - Medium
- August 12, 2026
Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to DOM-based cross-site scripting in jsonquery.js. Unencoded JSON string values reflected from stored fields are inserted into the DOM without sanitization, allowing attackers to run arbitrary JavaScript in the victim's browser.
XSS
Nagios CSRF Bypass via Double-Submit Cookie Before 4.5.14/2026R1.7
CVE-2026-48551
6.1 - Medium
- August 12, 2026
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.
Session Riding
Nagios Core<=4.5.14 & XI<2026R1.7 cmd.cgi Reflected XSS via NagFormId
CVE-2026-48550
5.1 - Medium
- August 12, 2026
Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to reflected cross-site scripting in cmd.cgi via the NagFormId parameter. An unauthenticated remote attacker can craft a malicious link that, when followed by an authenticated user, executes arbitrary JavaScript in the victim's browser.
XSS
Nagios Core application version 4.2.4 is vulnerable to Site-Wide Cross-Site Request Forgery (CSRF) in many functions
CVE-2020-35269
8.8 - High
- December 23, 2020
Nagios Core application version 4.2.4 is vulnerable to Site-Wide Cross-Site Request Forgery (CSRF) in many functions, like adding deleting for hosts or servers.
Session Riding
Nagios Core 4.4.2 has XSS
CVE-2018-18245
5.4 - Medium
- December 17, 2018
Nagios Core 4.4.2 has XSS via the alert summary reports of plugin results, as demonstrated by a SCRIPT element delivered by a modified check_load plugin to NRPE.
XSS
qh_echo in Nagios Core 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which
CVE-2018-13457
5.5 - Medium
- July 12, 2018
qh_echo in Nagios Core 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which allows attackers to cause a local denial-of-service condition by sending a crafted payload to the listening UNIX socket.
NULL Pointer Dereference
qh_core in Nagios Core 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which
CVE-2018-13458
5.5 - Medium
- July 12, 2018
qh_core in Nagios Core 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which allows attackers to cause a local denial-of-service condition by sending a crafted payload to the listening UNIX socket.
NULL Pointer Dereference
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