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Vulnerability record · CVE-2021-32820 · published 14 May 2021

CVE-2021-32820: Express handlebars project express handlebars information exposure vulnerability

EExpress Handlebars Project · Express Handlebars

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.

8.6 CVSS 3.1 High EPSS 16% · top 3.2% CWE-200 · Information exposureCWE-94 · Code injection
8.6CVSS 3.1 base score, v2 5.0
16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References, 4 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/express-handlebars/express-handlebars/blob/78c47a235c4ad7bc2674bddd8ec2721567ed8c72/README.md#danger- Third Party Advisory
https://github.com/express-handlebars/express-handlebars/commit/78c47a235c4ad7bc2674bddd8ec2721567ed8c72 PatchThird Party Advisory
https://github.com/express-handlebars/express-handlebars/pull/163 ExploitThird Party Advisory
https://securitylab.github.com/advisories/GHSL-2021-018-express-handlebars/ ExploitThird Party Advisory
https://www.npmjs.com/package/express-handlebars Third Party Advisory
https://github.com/express-handlebars/express-handlebars/blob/78c47a235c4ad7bc2674bddd8ec2721567ed8c72/README.md#danger- Third Party Advisory
https://github.com/express-handlebars/express-handlebars/commit/78c47a235c4ad7bc2674bddd8ec2721567ed8c72 PatchThird Party Advisory
https://github.com/express-handlebars/express-handlebars/pull/163 ExploitThird Party Advisory
https://securitylab.github.com/advisories/GHSL-2021-018-express-handlebars/ ExploitThird Party Advisory
https://www.npmjs.com/package/express-handlebars Third Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-32820), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.