PT-2026-29788 · Convoypanel · Panel

Published 2026-04-02 · Updated 2026-04-02 · CVE-2026-33746

Mitre

CVSS v3.1

9.8

Critical

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Fix

Improper Verification of Cryptographic Signature

Improper Authentication

Weakness Enumeration

CWE-347

CWE-287

Related Identifiers

CVE-2026-33746

Affected Products

Panel

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-33746 · Security Note
• https://github.com/ConvoyPanel/panel/security/advisories/GHSA-92pg-3w49-4w5x · Note
• https://github.com/ConvoyPanel/panel/releases/tag/v4.5.1 · Note