What’s Vulnerable › Vulnerabilities
CVE-2021-32820: File disclosure in Express Handlebars
- Severity: high (CVSS 8.6 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 15.7% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2021-05-14 · updated 2026-06-17
- Weakness: CWE-200
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.
Affected products
- express-handlebars: through 5.3.2
References
- https://github.com/express-handlebars/express-handlebars/blob/78c47a235c4ad7bc2674bddd8ec2721567ed8c72/README.md#danger-
- https://github.com/express-handlebars/express-handlebars/commit/78c47a235c4ad7bc2674bddd8ec2721567ed8c72
- https://github.com/express-handlebars/express-handlebars/pull/163
- https://securitylab.github.com/advisories/GHSL-2021-018-express-handlebars/
- https://www.npmjs.com/package/express-handlebars
- https://github.com/express-handlebars/express-handlebars/blob/78c47a235c4ad7bc2674bddd8ec2721567ed8c72/README.md#danger-
- https://github.com/express-handlebars/express-handlebars/commit/78c47a235c4ad7bc2674bddd8ec2721567ed8c72
- https://github.com/express-handlebars/express-handlebars/pull/163
- https://securitylab.github.com/advisories/GHSL-2021-018-express-handlebars/
- https://www.npmjs.com/package/express-handlebars
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