CVE-2026-33746Network attack vector

Unauthenticated user impersonation via unsigned JWT acceptance

Published Apr 2, 2026 · Updated Apr 2, 2026

Authentication bypass in Convoy 3.9.0-beta through 4.5.0 allows remote attackers to impersonate any user through JWT-based SSO. JWTService::decode() validates only token timestamps and omits the SignedWith constraint, so LoginController::authorizeToken accepts a forged user_uuid claim without verifying the HMAC-SHA256 signature. JWT-based SSO must be enabled and reachable; successful exploitation grants the permissions and data access of the selected Convoy user.

CVSS severity9.8
Critical
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Convoy 3.9.0-beta through 4.5.0 allows remote attackers to impersonate any user through JWT-based SSO. JWTService::decode() validates only token timestamps and omits the SignedWith constraint, so LoginController::authorizeToken accepts a forged user_uuid claim without verifying the HMAC-SHA256 signature. JWT-based SSO must be enabled and reachable; successful exploitation grants the permissions and data access of the selected Convoy user.

The record

CVE
CVE-2026-33746
Published
Apr 2, 2026
Updated
Apr 2, 2026
Vendor
Convoy Panel
Product
Convoy
Classifications
CWE-287, CWE-347, T1550.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 3.9.0-beta, < 4.5.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Convoy Panel · Convoyversion=>= 3.9.0-beta, < 4.5.1

Published CVSS scores

9.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
CWE-347Improper Verification of Cryptographic Signature
T1550.001Application Access Token

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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