---
title: "CVE-2026-53519: Nezha Monitoring: Pre-auth path traversal via /dashboard.. prefix confusion leaks jwt_secret_key"
url: https://erroneo.us/security/cve/CVE-2026-53519/
description: "CVE-2026-53519 (github.com/nezhahq/nezha (Go)): Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. Prior to…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-12
date_modified: 2026-06-26
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-53519"
kev: false
cvss: 9.1
epss: 0.02286
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 2.3% , percentile 83: FIRST’s model estimates a 2.3% chance of exploitation activity in the next 30 days, higher than 83% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes github.com/nezhahq/nezha (Go) < 2.0.13, fixed in 2.0.13 . Check your lockfile, including transitive dependencies.

## What it is

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 packages

- Go `github.com/nezhahq/nezha` < 2.0.13 → fixed: 2.0.13

## Affected products (CVE record)

- nezhahq nezha: < 2.0.13

## Severity

- GitHub_M CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`
- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 2.29% probability of exploitation activity in the next 30 days; percentile 83.

## Sources

- [GitHub Advisory GHSA-5c25-7vpj-9mqh](https://github.com/advisories/GHSA-5c25-7vpj-9mqh)
- [CVE.org record CVE-2026-53519](https://www.cve.org/CVERecord?id=CVE-2026-53519)
- [NVD entry CVE-2026-53519](https://nvd.nist.gov/vuln/detail/CVE-2026-53519)
- [github.com](https://github.com/nezhahq/nezha/security/advisories/GHSA-5c25-7vpj-9mqh)

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Source page: https://erroneo.us/security/cve/CVE-2026-53519/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt