What is CVE-2021-29455?

CVE-2021-29455 is a high-severity vulnerability in Grassroot Platform, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2021-04-19.

How severe is CVE-2021-29455?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Grassroot Platform

CVE-2021-29455

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).

EPSS: 0.008 (51.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Grassroot Grassroot_platform
Grassrootza Grassroot-platform — versions < 1.3.1

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
security-advisories@github.com (Product, Third Party Advisory, x_refsource_MISC)
security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-29455?: CVE-2021-29455 is a high-severity vulnerability in Grassroot Platform, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2021-04-19.
How severe is CVE-2021-29455?: High severity. CVSS v3 base score is 7.5 out of 10.