ConvoyPanel panel up to 4.5.0 JWTService::decode improper authentication

Summaryinfo

A vulnerability categorized as critical has been discovered in ConvoyPanel panel up to 4.5.0. Affected is the function JWTService::decode. The manipulation results in improper authentication. This vulnerability is identified as CVE-2026-33746. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in ConvoyPanel panel up to 4.5.0. Affected is the function JWTService::decode. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Convoy is a KVM server management panel for hosting businesses. From version 3.9.0-beta to before version 4.5.1, the JWTService::decode() method did not verify the cryptographic signature of JWT tokens. While the method configured a symmetric HMAC-SHA256 signer via lcobucci/jwt, it only validated time-based claims (exp, nbf, iat) using the StrictValidAt constraint. The SignedWith constraint was not included in the validation step. This means an attacker could forge or tamper with JWT token payloads — such as modifying the user_uuid claim — and the token would be accepted as valid, as long as the time-based claims were satisfied. This directly impacts the SSO authentication flow (LoginController::authorizeToken), allowing an attacker to authenticate as any user by crafting a token with an arbitrary user_uuid. This issue has been patched in version 4.5.1.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-33746 since 03/23/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

Upgrading to version 4.5.1 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

Vendor

• ConvoyPanel

Name

• panel

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5.0

Website

• Product: https://github.com/ConvoyPanel/panel/

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