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CVE-2026-33746

Convoypanel Convoy authentication bypass

9.8 CRITICALEPSS 0.39%
  1. Published2 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Convoypanel Convoy< 4.5.1

Remediation

Fixed in
Convoypanel Convoy≥ 4.5.1

References

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Frequently asked

Is CVE-2026-33746 being actively exploited?

CVE-2026-33746 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.39%.

How severe is CVE-2026-33746?

CVE-2026-33746 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.39% probability of exploitation.

Which products are affected by CVE-2026-33746?

Affected products include Convoypanel Convoy.

How do I fix CVE-2026-33746?

Upgrade affected software to a fixed version, for example Convoypanel Convoy 4.5.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33746 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.