CVE-2026-86117
Coolify through 4.3.17 OAuth Account Takeover via Unverified Email Matching
- State
- Published
- Severity
- 9.2 Critical
- Published
- Sep 5, 2026
- Updated
- Sep 24, 2026
- Reserved
- Sep 5, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.2 Critical | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 8.1 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-287 Improper Authentication
Affected Products
| Product | Versions |
|---|---|
coolifycoollabsio |
|
References
- Researcher write-uptechnical-description
- callback(): email-only match then Auth::logintechnical-description
- Unauthenticated /auth/{provider}/callback routetechnical-description
- https://github.com/coollabsio/coolifyproduct
- VulnCheck Advisory: Coolify through 4.3.17 OAuth Account Takeover via Unverified Email Matchingthird-party-advisory
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.