CVE-2026-33746
Convoy: JWT Signature Verification Bypass Allows Authentication as Arbitrary Users
Description
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.
INFO
Published Date :
April 2, 2026, 4:16 p.m.
Last Modified :
April 16, 2026, 5:38 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update Convoy to version 4.5.1 or later.
- Ensure JWT tokens are validated for cryptographic signatures.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-33746.
| URL | Resource |
|---|---|
| https://github.com/ConvoyPanel/panel/releases/tag/v4.5.1 | Release Notes |
| https://github.com/ConvoyPanel/panel/security/advisories/GHSA-92pg-3w49-4w5x | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-33746 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-33746
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-33746 vulnerability anywhere in the article.
-
Daily CyberSecurity
10.0 CVSS Flaw in Kestra Grants Full Server Control
A critical security vulnerability has been unmasked in Kestra, the popular open-source, event-driven orchestration platform. The flaw, tracked as CVE-2026-34612, carries a maximum CVSS score of 10.0, ... Read more
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Daily CyberSecurity
Critical JWT Bypass in Convoy Panel Allows Full Account Takeover
A critical security vulnerability has been unmasked in Convoy, the modern KVM server management panel used by businesses to manage virtualized infrastructure. The flaw, tracked as CVE-2026-33746, carr ... Read more
The following table lists the changes that have been made to the
CVE-2026-33746 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 16, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:convoypanel:convoy:*:*:*:*:*:*:*:* versions up to (excluding) 4.5.1 Added Reference Type GitHub, Inc.: https://github.com/ConvoyPanel/panel/releases/tag/v4.5.1 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/ConvoyPanel/panel/security/advisories/GHSA-92pg-3w49-4w5x Types: Vendor Advisory -
New CVE Received by [email protected]
Apr. 02, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-287 Added CWE CWE-347 Added Reference https://github.com/ConvoyPanel/panel/releases/tag/v4.5.1 Added Reference https://github.com/ConvoyPanel/panel/security/advisories/GHSA-92pg-3w49-4w5x