CVE-2021-29451: Manydesigns Portofino

Critical severity, CVSS 9.1. EPSS: 0.9% chance of exploitation in the next 30 days.

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. The issue will be patched in the upcoming 5.2.1 release.

Affected products

• Manydesigns Portofino: from 5.0.0, before 5.2.1 (fixed in 5.2.1)

Published 2021-04-16. Last modified 2026-06-17.