hacker-news · Crawled Jul 22, 2026
Hackers Exploit Windmill Flaw to Read Arbitrary Server Files Without Authentication
2 IoCs 2 CVEs
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AI Summary
Hackers are actively exploiting a high-severity unauthenticated path traversal vulnerability, CVE-2026-29059, in the open-source developer platform Windmill. The flaw exists in the 'get_log_file' endpoint, allowing attackers to read arbitrary files on the server by manipulating the filename parameter. A key target is the /proc/1/environ file to extract the SUPERADMIN_SECRET environment variable, which can enable superadmin authentication and arbitrary code execution if set. The vulnerability has been patched in Windmill 1.603.3, but exploitation attempts continue against exposed instances.
AI-extracted · verify before operational use
Extracted Entities 2 found
Indicators of Compromise 2 extracted
MITRE ATT&CK TTPs 12 techniques
T1059 Command and Scripting Interpreter · Execution T1070.004 File Deletion · Defense Evasion T1083 File and Directory Discovery · Discovery T1105 Ingress Tool Transfer · Command And Control T1135 Network Share Discovery · Discovery T1059.004 Unix Shell · Execution T1078 Valid Accounts · Defense Evasion T1190 Exploit Public-Facing Application · Initial Access T1210 Exploitation of Remote Services · Lateral Movement T1505.003 Web Shell · Persistence T1552 Unsecured Credentials · Credential Access T1619 Cloud Storage Object Discovery · Discovery