REST API: authentication bypass

librenms

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.

Fix it

Upgrade to librenms 26.8.0

First seen: 25 Oct 2026
Last update: 25 Oct 2026, 05:17 UTC
Fixed in: 26.8.0
Identifiers: CVE-2026-86426
CVSS: 9.8
Source: news

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## REST API: authentication bypass
Severity: critical. Patch status: patched.
Affected: librenms
Fixed in: 26.8.0
Ids: CVE-2026-86426

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.

## Steps
1. Search the repo, its CI and infra config for librenms. If present, report the version in use and whether it's affected.
2. Fix by release line: librenms: 26.8.0.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-86426") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://github.com/librenms/librenms/security/advisories/GHSA-cvq8-gqfq-3mvg https://nvd.nist.gov/vuln/detail/CVE-2026-86426
https://pwned.coffee/i/rest-api-authentication-bypass-cve-2026-86426

Timeline

25 Oct 2026, 05:17 UTC
Fix status: unknown → patched.
25 Oct 2026
First reported.

Receipt

Exploitation: Public exploit code, no attacks reported
CISA ADP “CISA ADP rates exploitation of CVE-2026-86426 "poc" (SSVC).” source
Fix by release line: Product Affected Fixed in Source
librenms before 26.8.0 26.8.0 CVE record (CNA)
Score: CVSS 9.8 (critical). CVSS 3.1 9.8 (NVD) for CVE-2026-86426
Last checked: 25 Oct 2026, 06:20 UTC

Product	Affected	Fixed in	Source
librenms	before 26.8.0	26.8.0	CVE record (CNA)

Sources: KEV – CVE record ✓ Vendor ✓

Sources

Totalone very hot coffee