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Cross-Site Scripting in mustache

High severity GitHub Reviewed Published Oct 24, 2017 to the GitHub Advisory Database • Updated Jan 9, 2023

Package

npm mustache (npm)

Affected versions

< 2.2.1

Patched versions

2.2.1

Description

Versions of mustache prior to 2.2.1 are affected by a cross-site scripting vulnerability when attributes in mustache templates are not quoted.

Example

Template:
<a href={{foo}}/>

Input:
{ 'foo' : 'test.com onload=alert(1)'}

Rendered result:
<a href=test.com onload=alert(1)/>

Recommendation

Update to version 2.2.1 or later.
Alternatively, ensure that all attributes in hmustache templates are encapsulated with quotes.

References

Published to the GitHub Advisory Database Oct 24, 2017
Reviewed Jun 16, 2020
Last updated Jan 9, 2023

Severity

High

EPSS score

0.234%
(62nd percentile)

Weaknesses

CVE ID

CVE-2015-8862

GHSA ID

GHSA-w3w8-37jv-2c58

Source code

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