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Vulnerabilities / CVE-2019-5420

critical

CVE-2019-5420

rubygem-rails: Weak secret token leading to possible code execution

Published Modified CWE 77, 330
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GHSA9.8CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat8.1CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Trivy's own label is CRITICAL. Rated critical by NVD, GHSA, Ruby Advisory DB. Rated lower by Red Hat (medium).

Description

A remote code execution vulnerability in development mode Rails <5.2.2.1, <6.0.0.beta3 can allow an attacker to guess the automatically generated development mode secret token. This secret token can be used in combination with other Rails internals to escalate to a remote code execution exploit.

Affected packages and fixed versions

SourcePackageFixed in
rubygems::GitHub Security Advisory RubyGemsrailties5.2.2.1
rubygems::Ruby Advisory Databaserailties~> 5.2.2, >= 5.2.2.1, >= 6.0.0.beta3
debian 11rails2:5.2.2.1+dfsg-1
debian 12rails2:5.2.2.1+dfsg-1
debian 13rails2:5.2.2.1+dfsg-1
debian 14rails2:5.2.2.1+dfsg-1
echorails2:5.2.2.1+dfsg-1

References

All 14 references

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.