Vulnerability report

Active exploitation observed Confirmed confidence Not in CISA KEV

CVE-2026-29059

Windmill: SUPERADMIN_SECRET (rarely used) can be accessed publicly

Windmill-labs / windmill · affected before 1.603.3

Watch CVE-2026-29059 Browse KEV feed
Severity
CVSS 6.9 · Medium
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
2.1%
First observed
03 Jul 2026
Last observed
13 Oct 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-29059 is an unauthenticated Windmill: SUPERADMIN_SECRET (rarely used) can be accessed publicly. Windmill is an open-source developer platform for internal code: APIs, background jobs, workflows and UIs. Prior...

Is it exploited?

Yes. Previdian sensors observed exploitation attempts with confirmed confidence. Also confirmed by third-party sources.

Who is affected?

Windmill-labs / windmill affected before 1.603.3.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

Windmill is an open-source developer platform for internal code: APIs, background jobs, workflows and UIs

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.

windmill-labs Affected
windmill
Before 1.603.3
Published
06 Mar 2026
Exploited Since
03 Jul 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

nuclei_scanner

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

The Hacker News

Recorded 22 Jul 2026

Previdian independently recorded this as exploited after first seeing it in honeypot sensors.

Active exploitation observed

Previdian sensor

First observed 03 Jul 2026

Previdian first observed exploitation attempts targeting this vulnerability in our honeypot sensors.

Proof of concept available

Nuclei Templates

Recorded 12 Jun 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
The Hacker News First 2026-07-22 12:36 UTC
Previdian Sensors 2026-07-22 15:04 UTC
The Shadowserver 2026-08-27 00:00 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Previdian sensors recorded exploitation attempts targeting this vulnerability. The cards and chart show volume, unique attackers, and daily activity.

65

Attempts observed

12

Unique attacker IPs

9

Attacker countries

BG · CH · ER · ID · JP · LT · NL · US · YE

16

Sensors observed

CVE-2026-29059 exploitation attempts over the last 82 days

Daily events observed by Previdian sensors

Updated 18 Oct 2026

0
8
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0
0
0
0
0
0
0
0
4
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0
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0
4
0
0
0
0
0
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0
0
0
0
0
0
0
0
0
2
0
10
8
0
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0
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8
4
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0
29 Jul 15 Aug 1 Sep 18 Sep 18 Oct

First observed 03 Jul 2026 · Last observed 13 Oct 2026

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Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
9
27
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Virtual patch status

Previdian virtual patch guidance is available for this CVE.

AWS WAF Cloudflare ModSecurity

Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

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Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-29059.yaml 03 Jun 2026

Virtual Patch Detail

Compensating WAF rules for this CVE.

Available

Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to Previdian Enterprise users.

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Risk and context

Severity, weaknesses, and research context

CVSS v4.0

6.9 Medium

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

2.1%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') CWE-22

Recent mention · The Hacker News

Hackers Exploit Windmill Flaw to Read Arbitrary Server Files Without Authentication

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...

Read full advisory

All CVSS Scores

CVSS 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

CVSS v3.1 7.5 High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

Windmill/Nextcloud Flow < 1.603.3 - Unauthenticated Path Traversal

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

  1. 11:35 UTC

    Virtual patch available

    Compensating WAF rule available to block exploitation

  2. 00:00 UTC

    KEV confirmed by The Shadowserver

    Exploitation attested by an external source

  3. 12:36 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  4. 04:25 UTC

    Indicators of compromise added (14)

    Indicators of compromise recorded

  5. 04:25 UTC

    Observed by Previdian sensors

    Evidence-backed exploitation signal

  6. 14:21 UTC

    Public PoC available

    Public proof-of-concept code published

  7. 04:30 UTC

    Nuclei template available

    Scanner coverage available

  8. 07:11 UTC

    CVE published

    Vulnerability disclosed publicly

  9. 17:50 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-29059

Sample API response 
{
  "cve_id": "CVE-2026-29059",
  "confidence": "Confirmed",
  "cvss_score": 6.9,
  "cvss_estimated": false,
  "epss_score": 0.02122,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 65, "sensors": 16 }
}