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CVE-2020-8264

MEDIUM
6.1
CVSS Score
Published: January 6, 2021 at 09:02 PM UTC
Updated: June 17, 2026 at 03:26 AM UTC
1 product affected across 1 vendorRails

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Severity
MEDIUM6.1
Exploit prediction
EPSS 67%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Rails· Rubyonrails
95%
6.0.0 ≤ v < 6.0.3.46.0.3.4
Affected range stops below 6.0.3.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCMailing ListThird Party Advisory
Source: [email protected]
https://groups.google.com/g/rubyonrails-security/c/yQzUVfv42jk/m/oJWw-xhNAQAJ
x_refsource_MISCExploitPatchThird Party Advisory
Source: [email protected]
https://hackerone.com/reports/904059

CVSS

6.1MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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