CVE-2025-55296 LibreNMS allows stored XSS in Alert Template name field

What is CVE-2025-55296?

CVE-2025-55296 is a medium-severity cross-site scripting vulnerability in Librenms Librenms, published on 18 Aug 2025. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

librenms is a community-based GPL-licensed network monitoring system. A stored Cross-Site Scripting (XSS) vulnerability exists in LibreNMS (<= 25.6.0) in the Alert Template creation feature. This allows a user with the admin role to inject malicious JavaScript, which will be executed when the template is rendered, potentially compromising other admin accounts. This vulnerability is fixed in 25.8.0.

Weakness: CWE-79

Which versions are affected by CVE-2025-55296?

2 open source packages ship an affected version, including librenms/librenms. It affects 1 product.

Products include Librenms Librenms.

How do I fix CVE-2025-55296?

Upgrade librenms/librenms to 25.8.0 or later.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2025-55296 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-55296 exists.

Other vulnerabilities in Librenms Librenms

• CVE-2023-4982 Cross-site Scripting (XSS) - Stored in librenms/librenms Critical 9.8
• CVE-2022-29712 Command injection in librenms Critical 9.8
• CVE-2021-44278 Path traversal in librenms/librenms Critical 9.8
• CVE-2019-10665 LibreNMS Information Disclosure Critical 9.8
• CVE-2018-20434 LibreNMS arbitrary OS commands execution Critical 9.8

All Librenms Librenms vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-vxq6-8cwm-wj99.