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).
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.008 (53.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Grassroot Platform
- Grassrootza Grassroot-Platform — versions < 1.3.1
Weakness classification (CWE)
References
- github.com/grassrootza/grassroot-platform/security/advisories/GHSA-f65w-6xw8-67… (Third Party Advisory)
- github.com/grassrootza/grassroot-platform/ (Product, Third Party Advisory)
- github.com/grassrootza/grassroot-platform/commit/a2e6e885f8183a066d938cf909fd81… (Patch, Third Party Advisory)
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.