CVE-2026-86426
9.8
CRITICAL · CVSS 3.1 · EPSS 3.9% (pctl 90)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
Description
LibreNMS before 26.8.0 contains an authentication bypass vulnerability in the REST API that allows unauthenticated attackers to access protected endpoints by sending numeric values instead of string tokens. Attackers can exploit MySQL type coercion by sending small integers like 0 through 9 to match token hashes, gaining access to API functionality including device credentials and administrative features that enable remote code execution through alert templates.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 3.87% — more likely to be exploited than 90% of all CVEs |
| Weakness | CWE-287 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2026-09-07 |
| Last modified | 2026-09-18 |
Affected (1)
| Vendor | Product |
|---|---|
| librenms | librenms |
References
→ the Explorer · watch your stack · NVD