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Prototype Pollution in handlebars

High severity GitHub Reviewed 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

Severity

High
7.3
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Weaknesses

CVE ID

No known CVE

GHSA ID

GHSA-q42p-pg8m-cqh6

Source code

No known source code
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