CVE-2026-53519 — Nezha Monitoring: Pre-auth path traversal via /dashboard.. prefix confusion leaks jwt_secret_key

Description (CNA)

Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. Prior to version 2.0.13, fallbackToFrontend in the dashboard's NoRoute handler treats any URL whose raw string starts with /dashboard as an admin-frontend asset request. The check uses strings.HasPrefix, not a path-segment match, so the input /dashboard../data/config.yaml is accepted; strings.TrimPrefix leaves ../data/config.yaml; and path.Join("admin-dist", "../data/config.yaml") normalizes to data/config.yaml — which os.Stat finds and http.ServeFile returns. No authentication required. This issue has been patched in version 2.0.13.

Affected (CNA)

Vendor / product	Versions
nezhahq / nezha	affected < 2.0.13

CWE

CWE-22

References

https://github.com/nezhahq/nezha/security/advisories/GHSA-5c25-7vpj-9mqh

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.