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CVE-2021-29455

7.5 · HIGH

Grassroot Platform is an application to make it faster, cheaper and easier to persistently organize and mobilize people in low-income communities.

Published Apr 19, 2021CWE-347EPSS 0.76%

Overview

CVE-2021-29455 is a high-severity vulnerability. It was published on April 19, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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).

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/grassrootza/grassroot-platform/GitHubgithub.com/grassrootza/grassroot-platform/commit/a2e6e885f8183a066d938cf909fd813a7af7d67fGitHubgithub.com/grassrootza/grassroot-platform/security/advisories/GHSA-f65w-6xw8-6734GitHubgithub.com/grassrootza/grassroot-platform/GitHubgithub.com/grassrootza/grassroot-platform/commit/a2e6e885f8183a066d938cf909fd813a7af7d67fGitHubgithub.com/grassrootza/grassroot-platform/security/advisories/GHSA-f65w-6xw8-6734

How CyberStrike helps

Frequently asked questions

What is CVE-2021-29455?

CVE-2021-29455 is a high-severity vulnerability. It was published on April 19, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-29455?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-29455?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-29455?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-29455 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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