onyx --cves cve-2020-8264

CVE-2020-8264

score: <0.1
cvss: 6.1
epss: 67.0%
published: 2021-01-06
kev added: —
first seen: 2026-10-21

actionpack gem >= 6.0.0 contains a reflected_xss caused by malicious URL input in the Actionable Exceptions middleware, letting attackers execute JavaScript in the application context, exploit requires attacker to send crafted URL.

Timeline

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

2021-01-06 Published
2026-10-21 Tracked by Onyx
2026-10-21 Public PoC

Exploit availability

Public PoC flagged by vulnx; no direct exploit link among the citations.

Weaknesses

CWE-79

References 2

https://groups.google.com/g/rubyonrails-security/c/yQzUVfv42jk/m/oJWw-xhNAQAJ
https://hackerone.com/reports/904059