Answer in brief
CVE-2015-8861 records a Medium severity (CVSS 6.1) vulnerability in Cross-Site Scripting in handlebars. The current sources do not mark it as known exploited. The current feed maps handlebars (npm). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps handlebars (npm). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| handlebarsnpm | >=0 <4.0.0 | 4.0.0 |
Published upstream
Oct 23, 2018
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Sep 10, 2026
Versions of `handlebars` prior to 4.0.0 are affected by a cross-site scripting vulnerability when attributes in handlebar templates are not quoted. ## Proof of Concept Template: ```<a href={{foo}}/>``` Input: ```{ 'foo' : 'test.com onload=alert(1)'}``` Rendered result: ```<a href=test.com onload=alert(1)/>``` ## Recommendation Update to version 4.0.0 or later. Alternatively, ensure that all attributes in handlebars templates are encapsulated with quotes.
Quoted source text, attributed separately from HOL analysis.