CVE-2026-29059

published 2026-03-06

CVE-2026-29059: Windmill is an open-source developer platform for internal code: APIs, background jobs, workflows and UIs. Prior to version 1.603.3, an unauthenticated path…

Priority P2 65 high 7.5 CVSS 3.1

AV N AC L PR N UI N S U C H I N A N

EXPLOIT

Windmill is an open-source developer platform for internal code: APIs, background jobs, workflows and UIs. Prior to version 1.603.3, an unauthenticated path traversal vulnerability exists in Windmill's get_log_file endpoint "(/api/w/{workspace}/jobs_u/get_log_file/{filename})". The filename parameter is concatenated into a file path without sanitization, allowing an attacker to read arbitrary files on the server using ../ sequences. This issue has been patched in version 1.603.3.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
windmill-labs	windmill	< 1.603.3	1.603.3
windmill	windmill	< 1.603.3	1.603.3

Detection & IOCs extracted from sources · hover to see the quote

url /api/w/_/jobs_u/get_log_file/..%2F..%2F..%2F..%2F..%2F..%2Fetc%2Fpasswd↗

url /api/w/_/jobs_u/get_log_file/..%2F..%2F..%2F..%2Fetc%2Fpasswd↗

url /index.php/apps/app_api/proxy/flow/api/w/_/jobs_u/get_log_file/..%25252F..%25252F..%25252F..%25252F..%25252F..%25252Fetc%25252Fpasswd↗

url /index.php/apps/app_api/proxy/flow/api/w/_/jobs_u/get_log_file/..%25252F..%25252F..%25252F..%25252Fetc%25252Fpasswd↗

path /api/w/{workspace}/jobs_u/get_log_file/{filename}↗

other shodan: http.html:"Windmill" http.html:"svelte-global-loader"↗

other fofa: app="Windmill"↗

• → HTTP GET response body containing 'root:x:0:0:' indicates successful /etc/passwd read via path traversal on the get_log_file endpoint ↗
• → Exploit requires no authentication; monitor unauthenticated GET requests to /api/w/*/jobs_u/get_log_file/ containing URL-encoded ../ sequences (%2F, %252F) ↗
• → Double URL-encoded traversal sequences (..%25252F) are used for the Nextcloud proxy path variant; detect both single (%2F) and double-encoded (%252F) traversal patterns ↗
• → The Nextcloud Flow attack surface is reachable via /index.php/apps/app_api/proxy/flow/ prefix, proxying requests to the Windmill backend ↗

• · Vulnerability is patched in Windmill version 1.603.3; only versions prior to 1.603.3 are affected ↗
• · The filename parameter is concatenated into a file path without sanitization; the root cause is missing input sanitization on the filename parameter of the get_log_file endpoint ↗

CVSS provenance

nvd v3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

nvd v4.0 6.9 MEDIUM CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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