CVE-2026-33168Network attack vector

Cross-site scripting via blank attribute names

Published Mar 23, 2026 · Updated Mar 23, 2026

Cross-site scripting in Rails Action View before 7.2.3.1 and affected 8.0 and 8.1 releases allows remote attackers to run browser script. The tag_options method passes blank top-level, data, and aria keys to xml_name_escape, which returns an empty attribute name and leaves a crafted value to be reparsed as another attribute. The application must accept user-defined HTML attributes, and exploitation requires a browser to render the malformed tag.

CVSS severity2.3
Low
EPSS probability0.71%
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 View before 7.2.3.1 and affected 8.0 and 8.1 releases allows remote attackers to run browser script. The tag_options method passes blank top-level, data, and aria keys to xml_name_escape, which returns an empty attribute name and leaves a crafted value to be reparsed as another attribute. The application must accept user-defined HTML attributes, and exploitation requires a browser to render the malformed tag.

The record

CVE
CVE-2026-33168
Published
Mar 23, 2026
Updated
Mar 23, 2026
Vendor
Rails
Product
Action View
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 23, 2026Record 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=< 7.2.3.1
  2. Affected versionversion=>= 8.0.0.beta1, < 8.0.4.1
  3. Affected versionversion=>= 8.1.0.beta1, < 8.1.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rails · Action Viewversion=< 7.2.3.1; version=>= 8.0.0.beta1, < 8.0.4.1; version=>= 8.1.0.beta1, < 8.1.2.1

Published CVSS scores

2.3GitHub, Inc. CNACVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA: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')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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