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CVE-2026-33746— Convoy: JWT Signature Verification Bypass Allows Authentication as Arbitrary Users

Quick assessment

Affected
ConvoyPanel panel
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Convoy是Convoy开源的一个为托管提供商和爱好者量身定制的现代平台。 Convoy 3.9.0-beta至4.5.1之前版本存在数据伪造问题漏洞，该漏洞源于JWT令牌签名未验证，可能导致身份验证绕过。

CVSS 9.8 · Critical EPSS 0.39% · P31
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I. Basic Information for CVE-2026-33746

Vulnerability Information
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Vulnerability Title
Convoy: JWT Signature Verification Bypass Allows Authentication as Arbitrary Users
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Convoy 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Convoy是Convoy开源的一个为托管提供商和爱好者量身定制的现代平台。 Convoy 3.9.0-beta至4.5.1之前版本存在数据伪造问题漏洞，该漏洞源于JWT令牌签名未验证，可能导致身份验证绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
ConvoyPanel panel >= 3.9.0-beta, < 4.5.1 -

II. Public POCs for CVE-2026-33746

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7730 chars
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III. Intelligence Information for CVE-2026-33746

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Vendor Advisories for CVE-2026-33746 (1)

Vendor Pages for CVE-2026-33746 (1)

IV. Related Vulnerabilities

Same product: panel
Same vendor: ConvoyPanel
Same weakness: CWE-287

V. Comments for CVE-2026-33746

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