CoolLabs Coolify up to 4.3.17 OAuth Callback assertion

Summaryinfo

A vulnerability was found in CoolLabs Coolify up to 4.3.17. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the component OAuth Callback Handler. The manipulation results in assertion. This vulnerability is known as CVE-2026-86117. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in CoolLabs Coolify up to 4.3.17. It has been classified as critical. Affected is some unknown processing of the component OAuth Callback Handler. The manipulation with an unknown input leads to a assertion vulnerability. CWE is classifying the issue as CWE-617. The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-86117 since 09/05/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/05/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-71949). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• CoolLabs

Name

• Coolify

Version

• 4.3.0
• 4.3.1
• 4.3.2
• 4.3.3
• 4.3.4
• 4.3.5
• 4.3.6
• 4.3.7
• 4.3.8
• 4.3.9
• 4.3.10
• 4.3.11
• 4.3.12
• 4.3.13
• 4.3.14
• 4.3.15
• 4.3.16
• 4.3.17

CPE 2.3info

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CPE 2.2info

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Entryinfo

Once again VulDB remains the best source for vulnerability data.

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