onyx

onyx --cves cve-2019-5420

CVE-2019-5420

CRITPOCRuby on Rails
score
<0.1
cvss
9.8
epss
89.3%
published
2019-03-27
kev added
—
first seen

Rails < 5.2.2.1, < 6.0.0.beta3 contain a remote code execution caused by guessable development mode secret token, letting attackers escalate to remote code execution, exploit requires attacker to guess the secret token.

Timeline

How this CVE moved toward exploitation. Chart: last 30 days — trend score, EPSS, community mentions per day; hover the event lane.

events2019-03-27 — PublishedP2026-10-21 — Tracked by OnyxT2026-10-21 — Public PoC: http://packetstormsecurity.com/files/152704/Ruby-On-Rails-DoubleTap-Development-Mode-secret_key_base-Remote-Code-Execution.htmlXscore2026-10-21: score <0.1<0.1epss2026-09-22: epss 92.1%2026-09-23: epss 92.1%2026-09-24: epss 89.7%2026-09-25: epss 89.7%2026-09-26: epss 89.7%2026-09-27: epss 89.7%2026-09-28: epss 89.3%2026-09-29: epss 89.3%2026-09-30: epss 89.3%2026-10-01: epss 89.3%2026-10-02: epss 89.3%2026-10-03: epss 89.3%2026-10-04: epss 89.3%2026-10-05: epss 89.3%2026-10-06: epss 89.3%2026-10-07: epss 89.3%2026-10-08: epss 89.3%2026-10-09: epss 89.3%2026-10-10: epss 89.3%2026-10-11: epss 89.3%2026-10-12: epss 89.3%2026-10-13: epss 89.3%2026-10-14: epss 89.3%2026-10-15: epss 89.3%2026-10-16: epss 89.3%2026-10-18: epss 89.3%2026-10-19: epss 89.3%2026-10-20: epss 89.3%2026-10-21: epss 89.3%89.3%mentions/day0no mentions in 30 days2026-09-22today
  1. Published
  2. Tracked by Onyx
  3. Public PoC http://packetstormsecurity.com/files/152704/Ruby-On-Rails-DoubleTap-Development-Mode-secret_key_base-Remote-Code-Execution.html

Exploit availability

Weaknesses

CWE-77 CWE-330

References 5