Ecosyste.ms: Advisories

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Security Advisories: GSA_kwCzR0hTQS12aDIyLTZjNmgtcm04cc4ABDOu

jte's HTML templates containing Javascript template strings are subject to XSS

Summary

Jte HTML templates with script tags or script attributes that include a Javascript template string (backticks) are subject to XSS.

Details

The javaScriptBlock and javaScriptAttribute methods in the Escape class (source) do not escape backticks, which are used for Javascript template strings. Dollar signs in template strings should also be escaped as well to prevent undesired interpolation.

PoC

  1. Use the Jte Gradle Plugin with the following code in src/jte/xss.jte: 
    @param String someMessage
<!DOCTYPE html>
<html lang="en">
<head>
    <title>XSS Test</title>
    <script>window.someVariable = `${someMessage}`;</script>
</head>
<body>
<h1>XSS Test</h1>
</body>
</html>
  2. Use the following Java code to demonstrate the XSS vulnerability: 
    final StringOutput output = new StringOutput();
JtexssGenerated.render(new OwaspHtmlTemplateOutput(output), null, "` + alert(`xss`) + `");
renderHtml(output);

Impact

HTML templates rendered by Jte's OwaspHtmlTemplateOutput in versions less than or equal to 3.1.15 with script tags or script attributes that contain Javascript template strings (backticks) are vulnerable.

Permalink: https://github.com/advisories/GHSA-vh22-6c6h-rm8q
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS12aDIyLTZjNmgtcm04cc4ABDOu
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: 4 days ago
Updated: 4 days ago


CVSS Score: 6.1
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Percentage: 0.00045
EPSS Percentile: 0.17569

Identifiers: GHSA-vh22-6c6h-rm8q, CVE-2025-23026
References: Repository: https://github.com/casid/jte
Blast Radius: 12.9

Affected Packages

maven:gg.jte:jte-runtime
Dependent packages: 1
Dependent repositories: 3
Downloads:
Affected Version Ranges: <= 3.1.15
Fixed in: 3.1.16
All affected versions: 1.0.0, 1.1.0, 1.2.0, 1.3.0, 1.4.0, 1.5.0, 1.5.1, 1.5.2, 1.6.0, 1.7.0, 1.8.0, 1.9.0, 1.10.0, 1.11.0, 1.11.1, 1.11.2, 1.11.3, 1.11.4, 1.12.0, 1.12.1, 2.0.0, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.1.0, 2.1.1, 2.1.2, 2.2.0, 2.2.1, 2.2.2, 2.2.3, 2.2.4, 2.2.6, 2.3.0, 2.3.1, 2.3.2, 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.1.5, 3.1.6, 3.1.7, 3.1.8, 3.1.9, 3.1.10, 3.1.11, 3.1.12, 3.1.13, 3.1.14, 3.1.15
All unaffected versions:
maven:gg.jte:jte
Dependent packages: 19
Dependent repositories: 130
Downloads:
Affected Version Ranges: <= 3.1.15
Fixed in: 3.1.16
All affected versions: 1.0.0, 1.1.0, 1.2.0, 1.3.0, 1.4.0, 1.5.0, 1.5.1, 1.5.2, 1.6.0, 1.7.0, 1.8.0, 1.9.0, 1.10.0, 1.11.0, 1.11.1, 1.11.2, 1.11.3, 1.11.4, 1.12.0, 1.12.1, 2.0.0, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.1.0, 2.1.1, 2.1.2, 2.2.0, 2.2.1, 2.2.2, 2.2.3, 2.2.4, 2.2.6, 2.3.0, 2.3.1, 2.3.2, 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.1.5, 3.1.6, 3.1.7, 3.1.8, 3.1.9, 3.1.10, 3.1.11, 3.1.12, 3.1.13, 3.1.14, 3.1.15
All unaffected versions: