Vulnerability · Published May 14, 2021 · Assigned by GitHub_M

CVE-2021-32817File disclosure in express-hbs

Medium 5.4

In plain English

A medium-severity information exposure in express-hbs from TryGhost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.3% (higher than 70% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)1.3%top 30.1% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

express-hbs is an Express handlebars template engine. express-hbs 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 .hbs appended to them. For complete details refer to the referenced GHSL-2021-019 report. Notes in documentation have been added to help users of express-hbs avoid this potential information exposure vulnerability.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	express-hbs	no fix listed	GHSA-rwxp-hwwf-653v

Affected products (as reported)

Vendor	Product	Versions
TryGhost	express-hbs	< 2.4.0

Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

References

https://securitylab.github.com/advisories/GHSL-2021-019-express-hbs/ x_refsource_CONFIRM
https://www.npmjs.com/package/express-hbs x_refsource_MISC
https://github.com/TryGhost/express-hbs#%EF%B8%8F-this-creates-a-potential-security-vulnerability x_refsource_MISC
https://github.com/TryGhost/express-hbs/commit/ff6fad6e357699412d4e916273314e5e7af1500e x_refsource_MISC