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Prototype Pollution in handlebars

high severity Published Jun 5, 2019 • Updated Aug 4, 2021

Package

npm handlebars (npm)

Affected versions

>= 4.1.0, < 4.1.2
>= 4.0.0, < 4.0.14
< 3.0.7

Patched versions

4.1.2
4.0.14
3.0.7

Description

Versions of handlebars prior to 4.0.14 are vulnerable to Prototype Pollution. Templates may alter an Objects' prototype, thus allowing an attacker to execute arbitrary code on the server.

Recommendation

For handlebars 4.1.x upgrade to 4.1.2 or later.
For handlebars 4.0.x upgrade to 4.0.14 or later.

References

GHSA ID

GHSA-q42p-pg8m-cqh6

CVSS Score

7.3 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L