CVE-2019-19919

highpriority · attend · 51EPSS 0.071 · 94 %ileexploit · PoCEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

7.07% (94th) EPSS

CVSS 7.5 · high

Is it mine?

51 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

Versions of handlebars prior to 4.3.0 are vulnerable to Prototype Pollution leading to Remote Code Execution. Templates may alter an Object's __proto__ and __defineGetter__ properties, which may allow an attacker to execute arbitrary code through crafted payloads.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · OSV

v3.19.3criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Psecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-1321USprimaryCWE-1321USCWE-74USCWE-74US

exploits (1)

Public proof-of-concept and weaponised exploit code.

fazilbaig1/CVE-2019-19919Handlebars Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') VulnerabilityPoC · poc_in_github

affected products (51)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
Juniper Networks Inc. Contrail Networking≤ R1912fstec_bduRU
Node.js Foundation handlebars≤ 4.3.0fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 10.3fstec_bduRU
handlebars.js project handlebars.js= 1.0.10nvdUScpe:2.3:a:handlebars.js_project:handlebars.js:*:*:*:*:*:*:*:*
handlebars.js project handlebars.js= 1.0.11nvdUScpe:2.3:a:handlebars.js_project:handlebars.js:*:*:*:*:*:*:*:*
handlebars.js project handlebars.js= 1.0.12nvdUScpe:2.3:a:handlebars.js_project:handlebars.js:*:*:*:*:*:*:*:*
handlebars.js project handlebars.js= 1.0.6nvdUScpe:2.3:a:handlebars.js_project:handlebars.js:*:*:*:*:*:*:*:*
handlebars.js project handlebars.js= 1.0.7nvdUScpe:2.3:a:handlebars.js_project:handlebars.js:*:*:*:*:*:*:*:*
handlebars.js project handlebars.js= 1.0.8nvdUScpe:2.3:a:handlebars.js_project:handlebars.js:*:*:*:*:*:*:*:*
handlebars.js project handlebars.js= 1.0.9nvdUScpe:2.3:a:handlebars.js_project:handlebars.js:*:*:*:*:*:*:*:*
handlebars.js project handlebars.js= 1.1.0nvdUScpe:2.3:a:handlebars.js_project:handlebars.js:*:*:*:*:*:*:*:*
handlebars.js project handlebars.js= 1.1.1nvdUScpe:2.3:a:handlebars.js_project:handlebars.js:*:*:*:*:*:*:*:*
handlebars.js project handlebars.js= 1.1.2nvdUScpe:2.3:a:handlebars.js_project:handlebars.js:*:*:*:*:*:*:*:*
handlebars.js project handlebars.js= 1.2.0nvdUScpe:2.3:a:handlebars.js_project:handlebars.js:*:*:*:*:*:*:*:*
handlebars.js project handlebars.js= 1.2.1nvdUScpe:2.3:a:handlebars.js_project:handlebars.js:*:*:*:*:*:*:*:*
handlebars.js project handlebars.js= 1.3.0nvdUScpe:2.3:a:handlebars.js_project:handlebars.js:*:*:*:*:*:*:*:*
handlebars.js project handlebars.js= 2.0.0nvdUScpe:2.3:a:handlebars.js_project:handlebars.js:*:*:*:*:*:*:*:*
handlebars.js project handlebars.js= 3.0.0nvdUScpe:2.3:a:handlebars.js_project:handlebars.js:*:*:*:*:*:*:*:*
handlebars.js project handlebars.js= 3.0.1nvdUScpe:2.3:a:handlebars.js_project:handlebars.js:*:*:*:*:*:*:*:*

showing 20 of 51

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-w457-6q6x-cgp9Prototype Pollution in handlebars2019-12-26ghsa · osvUS
Versions of `handlebars` prior to 3.0.8 or 4.3.0 are vulnerable to Prototype Pollution leading to Remote Code Execution. Templates may alter an Objects' `__proto__` and `__defineGetter__` properties, which may allow an attacker to execute arbitrary code through crafted payloads. ## Recommendation Upgrade to version 3.0.8, 4.3.0 or later.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd osv NVD CVE.org MITRE

published 2019-12-20modified 2026-06-17

related (708)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2026-34621US	—OT critical	7.23% (94th)	KEV	2026-04-11
Acrobat Reader versions 24.001.30356, 26.001.21367 and earlier are affected by an Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') vulnerab…
CVE-2019-0230US	critical9.8	96.9% (100th)	Exploit	2020-09-14
Apache Struts 2.0.0 to 2.5.20 forced double OGNL evaluation, when evaluated on raw user input in tag attributes, may lead to remote code execution.
CVE-2022-24760US	critical10.0	49.4% (99th)	Exploit	2022-03-12
Parse Server is an open source http web server backend. In versions prior to 4.10.7 there is a Remote Code Execution (RCE) vulnerability in Parse Server. This vulnerability affects…
CVE-2019-11358US	medium6.1	86.8% (100th)	Exploit	2019-04-20
jQuery before 3.4.0, as used in Drupal, Backdrop CMS, and other products, mishandles jQuery.extend(true, {}, ...) because of Object.prototype pollution. If an unsanitized source ob…
CVE-2020-7774US	critical9.8	69.4% (99th)	—	2020-11-17
The package y18n before 3.2.2, 4.0.1 and 5.0.5, is vulnerable to Prototype Pollution.

+703 more

references (12)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan