Missing validation of JWT signature in `ManyDesigns/Portofino`
Published Apr 16, 2021 · Updated Nov 3, 2026
Original summary
Normalized public record · Updated Nov 3, 2026
Missing validation of JWT signature in `ManyDesigns/Portofino`
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
[Portofino](https://github.com/ManyDesigns/Portofino) is an open source web development framework. Portofino before version 5.2.1 did not properly verify the signature of JSON Web Tokens. This allows forging a valid JWT.
Potential impact
Portofino is an open source web development framework. Portofino before version 5.2.1 did not properly verify the signature of JSON Web Tokens. This allows forging a valid JWT.
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
- SSVC priority
- MEDIUM
- Confidence
- Not available
- Aliases
- None reported
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
Record history
Published Apr 16, 2021 · Last refreshed Nov 3, 2026