Vulnerability · Published Oct 11, 2026 · Assigned by VulnCheck

CVE-2026-108715LibreNMS through 26.9.1.1 Authorization Bypass via Smokeping Graph auth.inc.php

Medium 4.3

In plain English

A medium-severity authorization bypass via user-controlled key in librenms from librenms. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.3%top 80.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

LibreNMS through 26.9.1.1 contains an authorization bypass vulnerability in includes/html/graphs/smokeping/auth.inc.php that checks the src probe device instead of the rendered target device. Restricted users permitted on a probe device can request smokeping_in or smokeping_out graphs with arbitrary device ids to view latency data and enumerate device names.

Affected products (as reported)

Vendor	Product	Versions
librenms	librenms	0 – through 26.9.1.1

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References

https://hackmd.io/@haind/librenms-smokeping-graph-src-device-auth-confusion third-party-advisory
https://github.com/librenms/librenms/blob/26.9.1.1/includes/html/graphs/smokeping/auth.inc.php#L3-L7 technical-description
https://github.com/librenms/librenms/blob/26.9.1.1/LibreNMS/Util/Graph.php#L190-L198 technical-description
https://github.com/librenms/librenms product
VulnCheck Advisory: LibreNMS through 26.9.1.1 Authorization Bypass via Smokeping Graph auth.inc.php third-party-advisory