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TI-2021-10168 Aliases CVE-2021-29455

Missing validation of JWT signature in `grassrootza/grassroot-platform`

Priority LOW 34CWE-347Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-347.

Summary

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).

Why it matters now

EPSS 0.00757 55th percentileScored 2026-11-07
Fix Fixed grassroot-platform (grassrootza): 1.3.1

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
grassrootzagrassroot-platformbefore 1.3.11.3.1Patch availableCNA
  • grassroot-platform Vendorgrassrootza Affected before 1.3.1 Fixed in 1.3.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:grassroot:grassroot_platform:*:*:*:*:*:*:*:*before 1.3.1VulnerableGrassroot
  • cpe:2.3:a:grassroot:grassroot_platform:*:*:*:*:*:*:*:* Versions before 1.3.1 Vulnerable ·Grassroot

Remediation

  • Fix · CNA grassroot-platform (grassrootza) Fixed in 1.3.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-29455

References

Patch 1

Advisory 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences