Description
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.
CVSS 9.4EPSS 0.439%Risque 0.98
Voir la source- Publication
- 2026-08-24 01:16:58
- Versions concernées
- <5.0.0
- Type
- Bibliothèque
- Dernière modification
- 2026-08-24 18:17:30
- Vecteur
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L