GHSA-j3gg-r6gp-95q2: Phoenix html Cross-Site Scripting Vulnerability

MODERATE
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CWE-79
Published
Advisory Summary

GHSA-j3gg-r6gp-95q2 is a MODERATE cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Phoenix html libraries in the Hex ecosystem. The issue involves xss in heex class attributes. Remediation is available by upgrading affected packages to version 3.0.4.

GHSA-j3gg-r6gp-95q2 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-j3gg-r6gp-95q2
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Phoenix html
Package Ecosystem Hex
Published Date
Last Updated

How to Fix GHSA-j3gg-r6gp-95q2

To remediate this vulnerability, upgrade all affected Phoenix html dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

phoenix_html fixed: 3.0.4 
Upgrade phoenix_html to 3.0.4
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for phoenix_html

How to Check if You Are Affected

To determine whether your application is affected by GHSA-j3gg-r6gp-95q2, inspect your project dependencies for Phoenix html:

inspect dependencies for phoenix_html

Analyze the terminal output to locate any version of Phoenix html in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.0.4), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Phoenix html, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

The `class` attribute was not protected against XSS attacks when using HEEx.

GHSA-j3gg-r6gp-95q2 Affected Phoenix html Versions

1 component(s)
Fixed Versions:
3.0.4
Product / Package Ecosystem Affected Versions Fixed Version
phoenix_html
 Hex
< 3.0.4
3.0.4

References

Security Fix Commit FIX COMMIT
https://github.com/phoenixframework/phoenix_html/commit/62a0139fb716bcdce697f6221244bd81d321d620
Phoenix html Source Repository REPOSITORY
https://github.com/phoenixframework/phoenix_html

Frequently Asked Questions

What is GHSA-j3gg-r6gp-95q2?
GHSA-j3gg-r6gp-95q2 is a security vulnerability in Phoenix html involving XSS in HEEx class attributes under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Phoenix html versions are affected?
Affected versions include releases prior to 3.0.4 across affected packages: phoenix_html.
What version fixes GHSA-j3gg-r6gp-95q2?
Upgrading to 3.0.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is phoenix_html affected?
Yes, phoenix_html is affected in releases prior to 3.0.4. Upgrade your dependency to 3.0.4 or later.
What CWE is associated with GHSA-j3gg-r6gp-95q2?
GHSA-j3gg-r6gp-95q2 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check Hex dependencies for GHSA-j3gg-r6gp-95q2?
Run the dependency tree command: 'inspect dependencies for phoenix_html'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-j3gg-r6gp-95q2",
  "modified" : "2022-04-12T20:22:57Z",
  "published" : "2022-04-12T20:22:57Z",
  "aliases" : [ ],
  "summary" : "XSS in HEEx class attributes",
  "details" : "The `class` attribute was not protected against XSS attacks when using HEEx.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Hex",
      "name" : "phoenix_html"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.0.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/phoenixframework/phoenix_html/commit/62a0139fb716bcdce697f6221244bd81d321d620"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/phoenixframework/phoenix_html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-04-12T20:22:57Z",
    "nvd_published_at" : null
  }
}