# CVE-2026-53519: Nezha - Path Traversal

> Live exploitation tracking for CVE-2026-53519 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2026-53519

## Key facts

- **Exploitation phase:** Limited Exploitation. The vulnerability is known but shows very limited attacker interest or exploitation activity.
- **CVSS score:** 9.1
- **Public exploit available:** Yes
- **Affected products:** NezhaHQ Nezha
- **Weaknesses:** CWE-22 (Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'))
- **Tags:** web_application, go

## Description

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.

## CrowdSec analysis

[CVE-2026-53519](https://euvd.enisa.europa.eu/vulnerability/CVE-2026-53519) is a critical path traversal vulnerability in Nezha versions before 2.0.13. The flaw allows unauthenticated remote attackers to bypass frontend path validation and access arbitrary files, potentially exposing sensitive configuration data and enabling further system compromise.

CrowdSec has been tracking this vulnerability and its exploits since 25th of August 2026.

According to CrowdSec data, while opportunistic exploitation dominates, a portion of threat actors trying to exploit CVE-2026-53519 apply basic targeting methods such as port or service detection. This indicates emerging patterns of selective targeting.
CrowdSec data also reveals a clear uptick in attacks involving CVE-2026-53519 over the past week. Activity is above the usual baseline, suggesting growing attention from attackers. This may reflect rising awareness, recent exploit releases, or expanded targeting efforts.

Attackers exploit the Nezha Dashboard’s path traversal by sending unauthenticated GET requests to URLs containing `/dashboard%2e%2e/`, such as `/dashboard%2e%2e/data/config.yaml`, to bypass the intended path prefix and read sensitive files.

## Timeline

- 2026-06-12: CVE Published. CVE-2026-53519 is published to NVD.
- 2026-08-25: Rule Released. CrowdSec releases a rule to detect CVE-2026-53519 exploitation attempts against the CrowdSec Network.
- 2026-08-28: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2026-53519 for the first time.

## References

- https://github.com/nezhahq/nezha/security/advisories/GHSA-5c25-7vpj-9mqh
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-53519.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2026-53519) follows observed exploitation activity for CVE-2026-53519. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.