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CVE-2026-33170— Rails Active Support has a possible XSS vulnerability in SafeBuffer#%

AI Predicted 6.1 Difficulty: Easy EPSS 0.33% · P26

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-33170

Vulnerability Information
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Vulnerability Title
Rails Active Support has a possible XSS vulnerability in SafeBuffer#%
Source: CVE Program / CVE List V5
Vulnerability Description
Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, `SafeBuffer#%` does not propagate the `@html_unsafe` flag to the newly created buffer. If a `SafeBuffer` is mutated in place (e.g. via `gsub!`) and then formatted with `%` using untrusted arguments, the result incorrectly reports `html_safe? == true`, bypassing ERB auto-escaping and possibly leading to XSS. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain 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:L/VA:N/SC:N/SI:N/SA:N
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 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rails是美国Rails团队的一套基于Ruby语言的开源Web应用框架。 Rails Active Support 8.1.2.1之前版本、8.0.4.1之前版本和7.2.3.1之前版本存在跨站脚本漏洞，该漏洞源于SafeBuffer#%未传播html_unsafe标志，可能导致绕过ERB自动转义并引发跨站脚本攻击。
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

VendorProductAffected VersionsCPESubscribe
railsactivesupport >= 8.1.0.beta1, < 8.1.2.1 -

II. Public POCs for CVE-2026-33170

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III. Intelligence Information for CVE-2026-33170

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Patches & Fixes for CVE-2026-33170 (4)

Vendor Advisories for CVE-2026-33170 (1)

Vendor Pages for CVE-2026-33170 (2)

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

CVE-2026-33167Rails has a possible XSS vulnerability in its Action Pack debug exceptions
CVE-2026-33168Rails has a possible XSS vulnerability in its Action View tag helpers
CVE-2026-33176Rails Active Support has a possible DoS vulnerability in its number helpers
CVE-2026-33173Rails Active Storage has possible content type bypass via metadata in direct uploads
CVE-2026-33174Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range request
CVE-2026-33169Rails Active Support has a possible ReDoS vulnerability in number_to_delimited
CVE-2026-33195Rails Active Storage has possible Path Traversal in DiskService
CVE-2026-33202Rails Active Storage has possible glob injection in its DiskService

IV. Related Vulnerabilities

Same product: activesupport
Same vendor: rails
Same weakness: CWE-79

V. Comments for CVE-2026-33170

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