EUVD-2026-21907
GHSA-5gm9-622f-qcg5
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/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
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/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
Lifecycle Timeline
7DescriptionCVE.org
LibreNMS versions before 26.3.0 are affected by an authenticated Cross-site Scripting vulnerability on the showconfig page. Successful exploitation requires administrative privileges. Exploitation could result in XSS attacks being performed against other users with access to the page.
AnalysisAI
Cross-site Scripting (XSS) in LibreNMS versions before 26.3.0 allows authenticated administrators to inject malicious scripts on the showconfig page, enabling attacks against other authorized users. The vulnerability requires high administrative privileges and user interaction (clicking a malicious link) to execute, resulting in integrity impact to other users' sessions. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Risk Assessment | CVSS 4.6 reflects a low-risk profile: network-accessible but requiring high administrative privileges (PR:H), user interaction (UI:A), and resulting only in limited integrity impact (VI:L) to other sessions, not confidentiality or availability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with stolen or compromised LibreNMS administrator credentials crafts a malicious URL containing JavaScript payload in the showconfig page parameters. The attacker sends this URL to another administrator or privileged user (via email, chat, or by embedding it in a report). … |
| Remediation | Upgrade LibreNMS to version 26.3.0 or later, which includes the fix for XSS on the showconfig page. … Detailed patch versions, workarounds, and compensating controls in full report. |
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