CVE-2021-29455: Grassroot Platform is an application to make it faster, cheaper and easier to persistently organize and mobili

Q: How do I fix CVE-2021-29455?

grassroot platform: upgrade to 1.3.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-29455 being exploited?

CVE-2021-29455 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-29455 affect?

CVE-2021-29455 affects grassroot platform. Severity is high (CVSS 7.5). 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 sign

Q: How urgent is CVE-2021-29455?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2021-29455 is a high-severity flaw (CVSS 7.5) affecting grassroot platform. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 deprecatio

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-347
Published	2021-04-19
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: grassroot

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-04-19 19:15 UTCPublished CVE record published
2026-06-17 03:47 UTCUpdated Record last modified

grassroot grassroot platform UPGRADE

Affected: < 1.3.1

Fixed in: 1.3.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy grassroot-platform || rpm -q grassroot-platform || grassroot-platform --version

2. UPGRADE to 1.3.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade grassroot-platform

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade grassroot-platform

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-29455?

grassroot platform: upgrade to 1.3.1. Exact commands for each OS are on this page.

Is CVE-2021-29455 being exploited?

CVE-2021-29455 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-29455 affect?

CVE-2021-29455 affects grassroot platform. Severity is high (CVSS 7.5). 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 sign

How urgent is CVE-2021-29455?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

References

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