CVE-2021-29455: Grassroot Platform

Medium severity, CVSS 5.3. EPSS: 0.8% chance of exploitation in the next 30 days.

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).

Affected products

• Grassroot Grassroot Platform: before 1.3.1 (fixed in 1.3.1)

Published 2021-04-19. Last modified 2026-06-17.