CVE-2026-86426: LibreNMS before 26.8.0 Authentication Bypass via API Token Type Confusion
Fixed in 26.8.0 · Affected: librenms before 26.8.0 · Exploitation: check available, not yet exploited
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 91% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- librenms · librenmsbefore 26.8.0
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Check available, not yet exploited. A public nuclei template can confirm it on a system you are authorised to test.
- CISA KEV
- Not listed
- Public check
- LibreNMS <= 26.7.0 - Unauthenticated API Access · nuclei template in projectdiscovery/nuclei-templates
- Vendor
- librenms
- Published
- September 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-86426 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.