Cross-site Scripting (XSS) Affecting rails package, versions <2:6.0.3.4+dfsg-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
66.99% (100th percentile)

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  • Snyk IDSNYK-ECHOLATEST-RAILS-18427208
  • published30 Jul 2026
  • disclosed6 Jan 2021

Introduced: 6 Jan 2021

CVE-2020-8264  (opens in a new tab)
CWE-79  (opens in a new tab)

How to fix?

Upgrade Echo:latest rails to version 2:6.0.3.4+dfsg-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rails package and not the rails package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

In actionpack gem >= 6.0.0, a possible XSS vulnerability exists when an application is running in development mode allowing an attacker to send or embed (in another page) a specially crafted URL which can allow the attacker to execute JavaScript in the context of the local application. This vulnerability is in the Actionable Exceptions middleware.

CVSS Base Scores

version 3.1