CVE-2026-86117
Coolify through 4.3.17 OAuth Account Takeover via Unverified Email Matching
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-287 |
| Vendor | coollabsio |
| Product | coolify |
| Published | Sep 5, 2026 |
| Last Updated | Sep 10, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
coollabsio / coolify
0 ≤ 4.3.17
References
github.com: https://github.com/geo-chen/oss/blob/main/coolify.md github.com: https://github.com/coollabsio/coolify/blob/v4.3.17/app/Http/Controllers/OauthController.php github.com: https://github.com/coollabsio/coolify/blob/v4.3.17/routes/web.php github.com: https://github.com/coollabsio/coolify vulncheck.com: https://www.vulncheck.com/advisories/coolify-through-4.3.17-oauth-account-takeover-via-unverified-email-matching
Credits
🔍 George Chen