{"apiVersion":"1.0","identifier":"CVE-2026-55182","description":"LibreNMS is a network monitoring system. In versions from 21.6.0 up to 26.5.0, the Signal alert transport is vulnerable to command injection because the signal-cli path and the Recipient field of an alert transport entry are insufficiently escaped before being passed to an exec call. An authenticated administrator can craft a transport entry whose Recipient contains shell metacharacters and whose path points to the bundled composer_wrapper.php script, which itself passes attacker-controlled input to further unsafe exec calls. By chaining these calls, the administrator can execute arbitrary operating-system commands on the LibreNMS host. This issue is fixed in version 26.5.0.","publishedAt":"2026-08-26T22:16:24","lastModifiedAt":"2026-08-27T17:18:48","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55182","cvssScore":8.6,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","epssProbability":0.01128,"riskScore":0.95,"affectedProduct":"LibreNMS","affectedVersions":">=21.6.0,<=26.5.0","vulnerabilityType":"Web app","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-55182","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-55182","en":"https://www.redsauce.net/en/cves/CVE-2026-55182","fr":"https://www.redsauce.net/fr/cves/CVE-2026-55182","pt":"https://www.redsauce.net/pt/cves/CVE-2026-55182","de":"https://www.redsauce.net/de/cves/CVE-2026-55182","sk":"https://www.redsauce.net/sk/cves/CVE-2026-55182","el":"https://www.redsauce.net/el/cves/CVE-2026-55182"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-55182"}}