Summary
XSS on the parameters:/addhost -> param: community
of Librenms versions 24.10.1 (https://github.com/librenms/librenms) allows remote attackers to inject malicious scripts. When a user views or interacts with the page displaying the data, the malicious script executes immediately, leading to potential unauthorized actions or data exposure.
Proof of Concept:
Navigate to the /addhost path.
Fill in all required fields.
In the Community field, enter the following payload:
"><img src=a onerror="alert(1)">.Submit the form to save changes.
5 The script will execute when the error alert "No reply with community + payload" appears.
Impact:
Execution of Malicious Code
Impact
Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.
CVE-2025-23201 has a CVSS score of 5.4 (Medium). The vector is network-reachable, no privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (24.11.0); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Remediation advice
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
Frequently Asked Questions
- What is CVE-2025-23201? CVE-2025-23201 is a medium-severity cross-site scripting (XSS) vulnerability in librenms/librenms (composer), affecting versions <= 24.10.1. It is fixed in 24.11.0. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
- How severe is CVE-2025-23201? CVE-2025-23201 has a CVSS score of 5.4 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of librenms/librenms are affected by CVE-2025-23201? librenms/librenms (composer) versions <= 24.10.1 is affected.
- Is there a fix for CVE-2025-23201? Yes. CVE-2025-23201 is fixed in 24.11.0. Upgrade to this version or later.
- Is CVE-2025-23201 exploitable, and should I be worried? Whether CVE-2025-23201 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2025-23201 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2025-23201? Upgrade
librenms/librenmsto 24.11.0 or later.