CVE-2026-86117
Received Received - Intake

Authentication Bypass in Coolify via OAuth Email Spoofing

Publication date: 2026-09-05

Last updated on: 2026-09-05

Assigner: VulnCheck

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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Meta Information

Published
2026-09-05
Last Modified
2026-09-05
Generated
2026-09-05
AI Q&A
2026-09-05
EPSS Evaluated
N/A
NVD
CVE-2026-86117
EUVD
EUVD-2026-71949

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
coolify coolify to 4.3.17 (inc)
coollabsio coolify to 4.3.17 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-287 When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

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Executive Summary

CVE-2026-86117 is an authentication bypass flaw in Coolify through version 4.3.17. It allows attackers to gain unauthorized access to user accounts by exploiting OAuth authentication. The vulnerability occurs because Coolify signs users into existing accounts based solely on matching email addresses during the OAuth callback process, without verifying provider assertions or binding OAuth identities. Attackers can register a victim's email on any enabled OAuth provider to obtain authenticated sessions, bypassing passwords and two-factor authentication.

Detection Guidance

To detect this vulnerability, check if Coolify is running version 4.3.17 or earlier. Inspect the OAuth callback endpoint /auth/{provider}/callback for unauthenticated access. Review logs for unusual authentication attempts using victim email addresses.

Impact Analysis

This vulnerability allows attackers to take over any user account, including administrators, by exploiting weak email-based matching in OAuth login. Attackers can bypass password requirements and two-factor authentication, gaining full control over the victim's account. This could lead to unauthorized access to sensitive data, system manipulation, or further attacks within the Coolify environment.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating GDPR and HIPAA compliance requirements. GDPR mandates strict access controls and data protection, while HIPAA requires safeguards for protected health information. A successful attack may result in data breaches, leading to legal penalties, reputational damage, and loss of trust.

Mitigation Strategies

Upgrade Coolify to the latest patched version immediately. Disable OAuth login temporarily if possible. Implement provider-verified email checks and enforce OAuth identity binding. Enable and enforce 2FA for all accounts.

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