EUVD-2026-69029
GHSA-r97f-5q78-rq8c
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/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
Network-sourced stored XSS needs no LibreNMS auth (PR:N), requires victim page-load (UI:R), and crosses scope boundary into authenticated browser context enabling session theft (S:C, C:H).
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.org
LibreNMS before 26.3.1 contains a stored cross-site scripting vulnerability in legacy PHP templates that output SNMP-sourced and syslog-sourced data without escaping. An attacker who controls a monitored network device can inject arbitrary JavaScript through SNMP interface descriptions or syslog program fields that executes when authenticated users view affected pages.
AnalysisAI
Stored XSS across multiple legacy PHP templates in LibreNMS allows an attacker who controls a monitored network device to inject arbitrary JavaScript via SNMP-polled fields (ifAlias, mempool_descr, storage_descr, sensor_descr) or syslog program fields, with payload execution triggered when any authenticated LibreNMS user browses alerts, health dashboards, or syslog views. The vulnerability spans at least five distinct template locations and stems from inconsistent output encoding - adjacent fields in the same code paths are correctly escaped, but affected fields are not. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to control a network device actively monitored by the target LibreNMS instance - achieved by compromising an enrolled device, spoofing a syslog sender permitted by source filtering, or introducing a rogue device accepted into SNMP polling scope. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 7.1 (AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N) accurately reflects a network-reachable, low-complexity path requiring no LibreNMS privileges but demanding attacker control over a polled device - a meaningful prerequisite that materially reduces exposure compared to a direct unauthenticated attack. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade LibreNMS to version 26.5.0 or later, which incorporates the fix per upstream commit https://github.com/librenms/librenms/commit/6782af940c3c495755923b520a302f3a1cb1ce6b and pull request https://github.com/librenms/librenms/pull/19660. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all LibreNMS deployments and versions, audit recent SNMP trap and syslog ingestion logs for suspicious payloads in ifAlias, mempool_descr, storage_descr, and sensor_descr fields, and assess whether monitored devices show signs of compromise or unauthorized access. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
In PHP versions 7.1.x below 7.1.33, 7.2.x below 7.2.24 and 7.3.x below 7.3.11 in certain configurations of FPM setup it
sapi/cgi/cgi_main.c in PHP before 5.3.12 and 5.4.x before 5.4.2, when configured as a CGI script (aka php-cgi), does not
(1) boardData102.php, (2) boardData103.php, (3) boardDataJP.php, (4) boardDataNA.php, and (5) boardDataWW.php in Netgear
The '/common/download_agent_installer.php' script in the Quest KACE System Management Appliance 8.0.318 is accessible by
ProjectSend versions prior to r1720 are affected by an improper authentication vulnerability. Rated critical severity (C
Roundcube Webmail contains a critical PHP object deserialization vulnerability (CVE-2025-49113, CVSS 9.9) that allows au
Util/PHP/eval-stdin.php in PHPUnit before 4.8.28 and 5.x before 5.6.3 allows remote attackers to execute arbitrary PHP c
Palo Alto Networks PAN-OS management web interface contains an authentication bypass allowing unauthenticated attackers
Nagios XI version xi-5.7.5 is affected by OS command injection. Rated high severity (CVSS 8.8), this vulnerability is re
Nagios XI version xi-5.7.5 is affected by OS command injection. Rated high severity (CVSS 8.8), this vulnerability is re
The get_referers function in /opt/ws/bin/sblistpack in Sophos Web Appliance before 3.7.9.1 and 3.8 before 3.8.1.1 allows
The Backup Migration plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 1
Same weakness CWE-79 – Cross-site Scripting (XSS)
View allShare
External POC / Exploit Code
Leaving vuln.today