Rails has a possible XSS vulnerability in its Action View tag helpers

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Summary

CVECVE-2026-33168
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-23 23:17:12 UTC
Updated2026-04-16 14:46:24 UTC
DescriptionAction View provides conventions and helpers for building web pages with the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, when a blank string is used as an HTML attribute name in Action View tag helpers, the attribute escaping is bypassed, producing malformed HTML. A carefully crafted attribute value could then be misinterpreted by the browser as a separate attribute name, possibly leading to XSS. Applications that allow users to specify custom HTML attributes are affected. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.

Risk And Classification

Primary CVSS: v4.0 2.3 LOW from [email protected]

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.000230000 probability, percentile 0.063620000 (date 2026-04-21)

Problem Types: CWE-79 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary2.3LOWCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNADECLARED2.3LOWCVSS: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 v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
Passive
Confidentiality
Low
Integrity
Low
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Rails Actionview affected >= 8.1.0.beta1, < 8.1.2.1 Not specified
CNA Rails Actionview affected >= 8.0.0.beta1, < 8.0.4.1 Not specified
CNA Rails Actionview affected < 7.2.3.1 Not specified

References

ReferenceSourceLinkTags
github.com/rails/rails/commit/c79a07df1e88738df8f68cb0ee759ad6128ca924 [email protected] github.com
github.com/rails/rails/commit/63f5ad83edaa0b976f82d46988d745426aa4a42d [email protected] github.com
github.com/rails/rails/security/advisories/GHSA-v55j-83pf-r9cq [email protected] github.com
github.com/rails/rails/commit/0b6f8002b52b9c606fd6be9e7915d9f944cf539c [email protected] github.com
github.com/rails/rails/releases/tag/v7.2.3.1 [email protected] github.com
github.com/rails/rails/releases/tag/v8.0.4.1 [email protected] github.com
github.com/rails/rails/releases/tag/v8.1.2.1 [email protected] github.com
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