High severity8.1NVD Advisory· Published Sep 5, 2026· Updated Sep 10, 2026
CVE-2026-86117
CVE-2026-86117
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.
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Affected products
1- Range: <=4.3.17
Patches
Vulnerability mechanics
References
4- github.com/coollabsio/coolify/blob/v4.3.17/app/Http/Controllers/OauthController.phpnvd
- github.com/coollabsio/coolify/blob/v4.3.17/routes/web.phpnvd
- github.com/geo-chen/oss/blob/main/coolify.mdnvd
- www.vulncheck.com/advisories/coolify-through-4.3.17-oauth-account-takeover-via-unverified-email-matchingnvd
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