CVE-2026-78207

Publié : 24 août 2026

Modifié : 24 août 2026

Score CVSS

9.4

CRITICAL

Description détaillée

exceljs-hardened before 5.0.0 contains a prototype pollution vulnerability in the deepMerge helper that fails to reject __proto__, constructor, or prototype keys when merging note objects. Attackers can assign parsed JSON with a malicious __proto__ property to cell notes, modifying Object.prototype and affecting all plain objects created in the process.

Vecteur d'attaque (CVSS)

Vecteur brut :CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Références et Patchs

https://github.com/exceljs/exceljs https://github.com/exceljs/exceljs/blob/v4.4.0/lib/utils/under-dash.js#L155-L181 https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-qwr4-7h29-chpf https://www.vulncheck.com/advisories/exceljs-through-prototype-pollution-via-deepmerge-reached-from-note-serialization

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