CVE-2020-8264Network attack vector

Cross-site scripting via unrestricted redirect URI schemes

Published Jan 6, 2021 · Updated Aug 4, 2024

Cross-site scripting in Rails Action Pack 6.0.0 through 6.0.3.3 allows remote attackers to execute JavaScript via a crafted URL. The ActionableExceptions.redirect_to method placed an attacker-controlled location in an HTML link without restricting the URI scheme, so a javascript URI ran when followed. Exploitation requires a development-mode application with Actionable Exceptions enabled and user interaction with the malicious link.

CVSS severity6.1
Medium
EPSS probability66.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Rails Action Pack 6.0.0 through 6.0.3.3 allows remote attackers to execute JavaScript via a crafted URL. The ActionableExceptions.redirect_to method placed an attacker-controlled location in an HTML link without restricting the URI scheme, so a javascript URI ran when followed. Exploitation requires a development-mode application with Actionable Exceptions enabled and user interaction with the malicious link.

The record

CVE
CVE-2020-8264
Published
Jan 6, 2021
Updated
Aug 4, 2024
Vendor
Rails
Product
Action Pack
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 6, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.0.3.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rails · Action Packversion=6.0.3.4

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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