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Vulnerability details: VCID-uaqs-9f9c-6yex
Vulnerability ID VCID-uaqs-9f9c-6yex
Aliases CVE-2024-28199
GHSA-242p-4v39-2v8g
Summary Cross-site Scripting (XSS) possible with maliciously formed HTML attribute names and values in Phlex There is a potential cross-site scripting (XSS) vulnerability that can be exploited via maliciously crafted user data. This was due to improper case-sensitivity in the code that was meant to prevent these attacks. ### Impact If you render an `<a>` tag with an `href` attribute set to a user-provided link, that link could potentially execute JavaScript when clicked by another user. ```ruby a(href: user_profile) { "Profile" } ``` If you splat user-provided attributes when rendering any HTML or SVG tag, malicious event attributes could be included in the output, executing JavaScript when the events are triggered by another user. ```ruby h1(**JSON.parse(user_attributes)) ``` ### Patches Patches are [available on RubyGems](https://rubygems.org/gems/phlex) for all `1.x` minor versions. The patched versions are: - [1.9.1](https://rubygems.org/gems/phlex/versions/1.9.1) - [1.8.2](https://rubygems.org/gems/phlex/versions/1.8.2) - [1.7.1](https://rubygems.org/gems/phlex/versions/1.7.1) - [1.6.2](https://rubygems.org/gems/phlex/versions/1.6.2) - [1.5.2](https://rubygems.org/gems/phlex/versions/1.5.2) - [1.4.1](https://rubygems.org/gems/phlex/versions/1.4.1) - [1.3.3](https://rubygems.org/gems/phlex/versions/1.3.3) - [1.2.2](https://rubygems.org/gems/phlex/versions/1.2.2) - [1.1.1](https://rubygems.org/gems/phlex/versions/1.1.1) - [1.0.1](https://rubygems.org/gems/phlex/versions/1.0.1) If you are on `main`, it has been patched since [`aa50c60`](https://github.com/phlex-ruby/phlex/commit/aa50c604cdee1d0ce7ef068a4c66cbd5d43f96a1) ### Workarounds Configuring a [Content Security Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy) that does not allow [`unsafe-inline`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy#unsafe-inline) would effectively prevent this vulnerability from being exploited. ### References In addition to upgrading to a patched version of Phlex, we strongly recommend configuring a Content Security Policy header that does not allow `unsafe-inline`. Here’s how you can configure a Content Security Policy header in Rails. https://guides.rubyonrails.org/security.html#content-security-policy-header
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
There are no known severity scores.
Reference id Reference type URL
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy#unsafe-inline
https://github.com/phlex-ruby/phlex
https://github.com/phlex-ruby/phlex/commit/aa50c604cdee1d0ce7ef068a4c66cbd5d43f96a1
CVE-2024-28199 https://nvd.nist.gov/vuln/detail/CVE-2024-28199
CVE-2024-28199.YML https://github.com/rubysec/ruby-advisory-db/blob/master/gems/phlex/CVE-2024-28199.yml
GHSA-242p-4v39-2v8g https://github.com/advisories/GHSA-242p-4v39-2v8g
GHSA-242p-4v39-2v8g https://github.com/phlex-ruby/phlex/security/advisories/GHSA-242p-4v39-2v8g
No exploits are available.
There are no known vectors.

No EPSS data available for this vulnerability.

Date Actor Action Source VulnerableCode Version
2026-06-02T04:47:20.137374+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/gem/phlex/CVE-2024-28199.yml 38.6.0