- Analyzer
- semgrep
- Category
- Authentication
- Default severity
- CRITICAL
- CWE
- CWE-347
- Execution
- Passive
- Authentication
- Not required
- Applicability
- python
- Availability
- stable
What it detects
JWT decoded without signature verification: an authentication check run by the semgrep analyzer.
Evidence
The Semgrep source location, rule identity, and bounded match context normalized into Fendix evidence.
Remediation
JWT decoded with signature verification disabled. This allows an attacker to forge tokens. Remove options={"verify_signature": False} and specify a strong algorithm.
Limitations
This check is limited to the applicability and evidence delivered by semgrep. Review the evidence in context; a match is a finding input, while confidence and policy determine its disposition.
Related reference
Analyzer Registry · Findings and release decisions · Policy and confidence
Remediation guidance: Remediation and fix verification · Baselines and suppressions