CVE-2019-20920

Name	CVE-2019-20920
Description	Handlebars before 3.0.8 and 4.x before 4.5.3 is vulnerable to Arbitrary Code Execution. The lookup helper fails to properly validate templates, allowing attackers to submit templates that execute arbitrary JavaScript. This can be used to run arbitrary code on a server processing Handlebars templates or in a victim's browser (effectively serving as XSS).
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
node-handlebars (PTS)	bullseye	3:4.7.6+~4.1.0-2	fixed
	forky, bookworm, sid, trixie	3:4.7.7+~4.1.0-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version
libjs-handlebars	source	(unstable)	(unfixed)
node-handlebars	source	buster	3:4.1.0-1+deb10u3
node-handlebars	source	(unstable)	3:4.5.3-1

Notes

[stretch] - libjs-handlebars <ignored> (Only reverse depends was diaspora which not in stretch and too intrusive to backport)
https://snyk.io/vuln/SNYK-JS-HANDLEBARS-534478
https://www.npmjs.com/advisories/1316
https://www.npmjs.com/advisories/1324