---
title: "CVE-2020-8264: https://github.com/rails/rails vulnerability | CubePath"
description: "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…"
language: en
source: https://cubepath.com/security/cve/CVE-2020-8264
---

# CVE-2020-8264: https://github.com/rails/rails vulnerability | CubePath

## Description

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.

Official description from the CVE record, published by hackerone. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2020-8264)

## Key data

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.66986 (67.0% probability)

Percentile

99.3%

Scores of

Nov 10, 2026

Model

v2026.06.15

### Weakness (CWE)

CWE catalog version 5.0.

CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license.

- [CWE-79](https://cwe.mitre.org/data/definitions/79.html) Improper Neutralization of Input During Web Page Generation

## Affected products

Products listed in the CVE record, as the CNA published them.

- https://github.com/rails/rails

  - affected: 6.0.3.4

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [hackerone.com/reports/904059](https://hackerone.com/reports/904059)
- [groups.google.com/g/rubyonrails-security/c/yQzUVfv42jk/m/oJ…](https://groups.google.com/g/rubyonrails-security/c/yQzUVfv42jk/m/oJWw-xhNAQAJ)

## Timeline

1. ID reserved Jan 28, 2020
2. Record published Jan 6, 2021
3. Record last updated Aug 4, 2024

## Look up another CVE

## About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.

[Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection)

Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:01 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)