How broadly exploitable is this vulnerability?

Exploitability depends on who can supply JWTs to the SSO endpoint. If external clients or integrated services can present arbitrary tokens, an attacker with network access to the login flow can forge tokens and gain access. In tightly isolated environments where token submission is heavily constrained, practical exploitability may be reduced but not eliminated.

Does an attacker need valid credentials or prior access?

No. The flaw resides in how tokens are validated, not how they are obtained. An attacker does not need a legitimate token to start from; they can construct a syntactically valid JWT from scratch with chosen claims and rely on the absence of signature verification to have it accepted.

What is the safest general fix pattern?

The safest pattern is to centralize JWT handling and require that every token pass both integrity and validity checks: validate the signature against a known key and expected algorithm, confirm issuer/audience constraints, and check time-based claims, failing closed on any discrepancy. Avoid custom ad-hoc validation and rely on library primitives that enforce these checks by default.

Severity:

CRITICAL RISK

(9.8)

Improper JWT Signature Verification (CWE-347) Enabling Broken Authentication (CWE-287) in Convoy SSO

CVE-2026-33746

Published:

Apr 2, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-94

HIGH RISK

HIGH

(8.8)

PHP Code Injection via File Upload (CWE-94) in Aero CMS Admin Post Creation

Remote Code Execution by authenticated users via malicious file upload

May 10, 2026

CWE-94

HIGH RISK

HIGH

(8.8)

Code Injection (CWE-94) via Module Parameters in Evolution CMS

Remote Code Execution by Authenticated Users

May 10, 2026

Vulnerability Type

Category:

Broken Authentication / Improper Signature Verification

CWE:

CWE-287;CWE-347

Impact:

Authentication Bypass and Account Impersonation

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Broken Authentication / Improper Signature Verification

CWE:

CWE-287;CWE-347

Impact:

Authentication Bypass and Account Impersonation

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

Detect vulnerable code directly in pull requests, so CVEs are fixed before merge.

Get Started

Ship clean & secure code faster

Start Free Trial

Get Pentest Report

Ship clean & secure code faster

Start Free Trial

Get Pentest Report

Ship clean & secure code faster

Start Free Trial

Get Pentest Report

CodeAnt AI is an offensive and defensive security platform.

Defensive + offensive security.

From first line of code to a pentest
that knows every line of it.

SOC 2 Type II certified | CodeAnt AI is independently audited and compliant with SOC 2 Type II security standards

Ask AI for summary of CodeAnt

Defensive + offensive security.

From first line of code to a pentest
that knows every line of it.

Ask AI for summary of CodeAnt

Defensive + offensive security.

From first line of code to a pentest
that knows every line of it.

Ask AI for summary of CodeAnt

Improper JWT Signature Verification (CWE-347) Enabling Broken Authentication (CWE-287) in Convoy SSO

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.8)

PHP Code Injection via File Upload (CWE-94) in Aero CMS Admin Post Creation

HIGH RISK

HIGH

(8.8)

Code Injection (CWE-94) via Module Parameters in Evolution CMS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

Product

Compare

Company

Developers

Legal

Product

Compare

Company

Developers

Legal

Product

Compare

Company

Developers

Legal