Auth bypass in Coollabsio Coolify
CVE-2026-86117
Coolify through 4.3.17 contains an authentication bypass vulnerability in the OAuth callback handler that signs users into existing accounts based solely on email address without verifying provider assertions or binding OAuth identities. Attackers can register a victim's email address on any enabled OAuth provider to obtain authenticated sessions as that user, bypassing password requirements and two-factor authentication.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (51.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
Weakness classification (CWE)
References
- github.com/coollabsio/coolify (product)
- callback(): email-only match then Auth::login (technical-description)
- Unauthenticated /auth/{provider}/callback route (technical-description)
- Researcher write-up (technical-description)
- VulnCheck Advisory: Coolify through 4.3.17 OAuth Account Takeover via Unverified Email Matching (third-party-advisory)
Frequently asked questions
- What is CVE-2026-86117?
- CVE-2026-86117 is a high-severity vulnerability in Coollabsio Coolify, classified under Improper Authentication. CVSS score: 8.1/10. Published 2026-09-05.
- How severe is CVE-2026-86117?
- High severity. CVSS v3 base score is 8.1 out of 10.