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CVE-2026-33167— Rails has a possible XSS vulnerability in its Action Pack debug exceptions

Quick assessment

Affected
rails actionpack
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Rails Action Pack是美国Rails团队的一个web框架。提供了路由机制（将请求URL映射到动作），定义实现动作的控制器以及通过渲染视图（各种格式的模板）生成响应的机制。 Rails Action Pack 8.1.2.1之前版本存在跨站脚本漏洞，该漏洞源于调试异常页面未正确转义异常消息，可能导致精心构造的异常消息注入任意HTML和JavaScript，造成跨站脚本攻击。

AI Predicted 6.1 Difficulty: Moderate EPSS 0.33% · P23
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I. Basic Information for CVE-2026-33167

Vulnerability Information
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Vulnerability Title
Rails has a possible XSS vulnerability in its Action Pack debug exceptions
Source: CVE Program / CVE List V5
Vulnerability Description
Action Pack is a Rubygem for building web applications on the Rails framework. In versions on the 8.1 branch prior to 8.1.2.1, the debug exceptions page does not properly escape exception messages. A carefully crafted exception message could inject arbitrary HTML and JavaScript into the page, leading to XSS. This affects applications with detailed exception pages enabled (`config.consider_all_requests_local = true`), which is the default in development. Version 8.1.2.1 contains a patch.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Rails Action Pack 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rails Action Pack是美国Rails团队的一个web框架。提供了路由机制（将请求URL映射到动作），定义实现动作的控制器以及通过渲染视图（各种格式的模板）生成响应的机制。 Rails Action Pack 8.1.2.1之前版本存在跨站脚本漏洞，该漏洞源于调试异常页面未正确转义异常消息，可能导致精心构造的异常消息注入任意HTML和JavaScript，造成跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rails actionpack >= 8.1.0, < 8.1.2.1 -

II. Public POCs for CVE-2026-33167

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III. Intelligence Information for CVE-2026-33167

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Patches & Fixes for CVE-2026-33167 (1)

Vendor Advisories for CVE-2026-33167 (1)

Vendor Pages for CVE-2026-33167 (1)

Same Patch Batch · rails · 2026-03-23 · 9 CVEs total

CVE-2026-33195 8.0 HIGH Rails Active Storage has possible Path Traversal in DiskService
CVE-2026-33168 Rails has a possible XSS vulnerability in its Action View tag helpers
CVE-2026-33170 Rails Active Support has a possible XSS vulnerability in SafeBuffer#%
CVE-2026-33176 Rails Active Support has a possible DoS vulnerability in its number helpers
CVE-2026-33173 Rails Active Storage has possible content type bypass via metadata in direct uploads
CVE-2026-33174 Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range request
CVE-2026-33169 Rails Active Support has a possible ReDoS vulnerability in number_to_delimited
CVE-2026-33202 Rails Active Storage has possible glob injection in its DiskService

IV. Related Vulnerabilities

Same vendor: rails
Same weakness: CWE-79

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