PT-2026-28566 · Unknown · Handlebars

Byamb4 · Publicado 2026-03-26 · Atualizado 2026-06-04 · CVE-2026-33916

Positive Technologies (AI Summary)

CVSS v3.1

4.7

Média

Vetor base

AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Handlebars versions 4.0.0 through 4.7.8

Description Handlebars is a templating engine that allows users to build semantic templates. Versions 4.0.0 through 4.7.8 contain a flaw in the resolvePartial() function within the Handlebars runtime. This function resolves partial names using a property lookup on options.partials without preventing prototype chain traversal. If Object.prototype is polluted with a string value matching a partial reference in a template, the polluted string is used as the partial body and rendered without HTML escaping, potentially leading to reflected or stored cross-site scripting (XSS).

Recommendations Update to version 4.7.9 or later. Apply Object.freeze(Object.prototype) early in application startup. Use the Handlebars runtime-only build (handlebars/runtime).

Exploit

Correção

XSS

Prototype Pollution

Enumeração de Fraquezas

CWE-79

CWE-1321

Identificadores relacionados

CLEANSTART-2026-AD27625

CLEANSTART-2026-BE61221

CLEANSTART-2026-KS09647

CLEANSTART-2026-LC05413

CLEANSTART-2026-TW25027

CLEANSTART-2026-TZ34913

CVE-2026-33916

GHSA-2QVQ-RJWJ-GVW9

Produtos afetados

Handlebars

Referências · 262

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33916.json · Exploit
• https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.9 · Nota
• https://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2 · Correção
• https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-2qvq-rjwj-gvw9 · Aviso do Fabricante
• https://github.com/handlebars-lang/handlebars.js · Nota
• https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-LC05413.json · Nota
• https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-BE61221.json · Nota
• https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-AD27625.json · Nota
• https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-TW25027.json · Nota
• https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-KS09647.json · Nota
• https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-TZ34913.json · Nota
• https://osv.dev/vulnerability/ghsa-23c5-xmqv-rm74 · Nota
• https://osv.dev/vulnerability/ghsa-458j-xx4x-4375 · Nota
• https://osv.dev/vulnerability/CVE-2026-2950 · Nota
• https://osv.dev/vulnerability/ghsa-v8w9-8mx6-g223 · Nota