What’s Vulnerable › Vulnerabilities

CVE-2021-29451: Missing validation of JWT signature in `ManyDesigns/Portofino`

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-16 · updated 2026-06-17
• Weakness: CWE-347

Description

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

How to fix

Upgrade to a fixed version: ManyDesigns Portofino 5.2.1. Check the vendor advisory for mitigations.

References

• https://github.com/ManyDesigns/Portofino/commit/8c754a0ad234555e813dcbf9e57d637f9f23d8fb
• https://github.com/ManyDesigns/Portofino/security/advisories/GHSA-6g3c-2mh5-7q6x
• https://mvnrepository.com/artifact/com.manydesigns/portofino
• https://github.com/ManyDesigns/Portofino/commit/8c754a0ad234555e813dcbf9e57d637f9f23d8fb
• https://github.com/ManyDesigns/Portofino/security/advisories/GHSA-6g3c-2mh5-7q6x
• https://mvnrepository.com/artifact/com.manydesigns/portofino

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