SQL Injection in Nextcloud Flow
CVE-2026-23696
Windmill CE and EE versions 1.276.0 through 1.603.2 contain an SQL injection vulnerability in the folder ownership management functionality that allows authenticated attackers to inject SQL through the owner parameter. An attacker can use the injection to read sensitive data such as the JWT signing secret and administrative user identifiers, forge an administrative token, and then execute arbitrary code via the workflow execution endpoints.
Vulnerability class: SQL Injection
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.136 (96.3th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.160 · newest: 0.136 · change: -0.024
Affected products
- Nextcloud Flow — versions 1.0.0, 1.3.0, 1.3.1
- Windmill Labs Ce (Community Edition) — versions 1.276.0, 1.603.3
- Windmill Labs Ee (Enterprise Edition) — versions 1.276.0, 1.603.3
Weakness classification (CWE)
References
- chocapikk.com/posts/2026/windfall-nextcloud-flow-windmill-rce/ (technical-description, exploit)
- github.com/Chocapikk/Windfall (exploit)
- github.com/windmill-labs/windmill/releases/tag/v1.603.3 (release-notes)
- github.com/windmill-labs/windmill/commit/942fb629210ebb287f48467d1535ffde3a3eea… (patch)
- www.windmill.dev/ (product)
- apps.nextcloud.com/apps/flow/releases (release-notes)
- www.vulncheck.com/advisories/windmill-file-ownership-handling-sqli-rce (third-party-advisory)
Frequently asked questions
- What is CVE-2026-23696?
- CVE-2026-23696 is a critical-severity vulnerability in Nextcloud Flow, classified under SQL Injection. CVSS score: 9.9/10. Published 2026-04-07.
- How severe is CVE-2026-23696?
- Critical severity. CVSS v3 base score is 9.9 out of 10.