CVE-2026-86117
High
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.
SeverityHigh
CVSS8.1
Exploit probability—
ProductCoollabsio Coolify
PublishedSep 5, 2026
First seenSep 5, 2026
Weakness typeCWE-287Improper authentication
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| coollabsio coolify | v ≤ 4.3.17 | — |
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