Critical

Hackers Exploit Windmill Flaw to Read Arbitrary Server Files Without Authentication

The Hacker News

July 22, 2026 at 12:36 PM

Actively Exploited

Overview

A serious security vulnerability has been discovered in Windmill, an open-source developer platform, allowing attackers to access arbitrary server files without authentication. This flaw, identified as CVE-2026-29059, has a CVSS score of 7.5 and affects the 'get_log_file' endpoint of the platform. Specifically, the issue arises from how the filename parameter is handled, enabling unauthorized users to exploit path traversal techniques to read sensitive files on the server. Researchers at VulnCheck have reported that this vulnerability is currently being exploited in the wild, raising urgent concerns for developers and organizations using Windmill. Users are advised to take immediate action to secure their systems as the risk of unauthorized data access increases significantly during active exploitation.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: Windmill open-source developer platform, specifically the '/api/w/{workspace}/jobs_u/get_log_file/{filename}' endpoint.
Action Required: Users should update to the latest version of Windmill that addresses this vulnerability.
Timeline: Newly disclosed

Original Article Summary

A high-severity security flaw impacting open-source developer platform Windmill has come under active exploitation in the wild, per VulnCheck. The vulnerability in question is CVE-2026-29059 (CVSS score: 7.5), a case of unauthenticated path traversal impacting Windmill's "get_log_file" endpoint ("/api/w/{workspace}/jobs_u/get_log_file/{filename}"). "The filename parameter is concatenated into

Impact

Windmill open-source developer platform, specifically the '/api/w/{workspace}/jobs_u/get_log_file/{filename}' endpoint.

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

Users should update to the latest version of Windmill that addresses this vulnerability. Additionally, it is recommended to implement strict input validation on the filename parameter to prevent path traversal attacks. Organizations should also review their server configurations to limit file access permissions.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to CVE, Exploit, Vulnerability.

Read Original Article

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