CVE-2021-32820

Description

Express-handlebars is a Handlebars view engine for Express. Express-handlebars mixes pure template data with engine configuration options through the Express render API. More specifically, the layout parameter may trigger file disclosure vulnerabilities in downstream applications. This potential vulnerability is somewhat restricted in that only files with existing extentions (i.e. file.extension) can be included, files that lack an extension will have .handlebars appended to them. For complete details refer to the referenced GHSL-2021-018 report. Notes in documentation have been added to help users avoid this potential information exposure vulnerability.

How to fix CVE-2021-32820

To remediate CVE-2021-32820, upgrade the affected package to a fixed version below.

• —upgrade to 5.3.3 or later
• —upgrade to 5.3.1 or later

Is CVE-2021-32820 being exploited?

Moderate — EPSS is 18.0%. Track this CVE but it's not at the top of the prioritisation list.

Affected packages (2)

• from 0, < 5.3.3
• from 0, < 5.3.1

CVSS scores

References (8)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-32820
• ADVISORYsecuritylab.github.com/advisories/GHSL-2021-018-express-handlebars
• WEBgithub.com/express-handlebars/express-handlebars#danger-
• WEBgithub.com/express-handlebars/express-handlebars/blob/78c47a235c4ad7bc2674bddd8ec2721567ed8c72/README.md#danger-