What’s Vulnerable › Vulnerabilities

CVE-2023-30533: Prototype Pollution in sheetJS

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-04-24 · updated 2026-06-17
• Weakness: CWE-1321

Description

SheetJS Community Edition before 0.19.3 allows Prototype Pollution via a crafted file. In other words. 0.19.2 and earlier are affected, whereas 0.19.3 and later are unaffected.

Affected products

• Sheetjs: before 0.19.3 — fixed in 0.19.3
• Npm Xlsx: all versions

How to fix

Upgrade to a fixed version: Sheetjs 0.19.3. Check the vendor advisory for mitigations.

References

• https://cdn.sheetjs.com/advisories/CVE-2023-30533
• https://git.sheetjs.com/sheetjs/sheetjs/issues/2986
• https://git.sheetjs.com/sheetjs/sheetjs/src/branch/master/CHANGELOG.md
• https://cdn.sheetjs.com/advisories/CVE-2023-30533
• https://git.sheetjs.com/sheetjs/sheetjs/issues/2986
• https://git.sheetjs.com/sheetjs/sheetjs/src/branch/master/CHANGELOG.md

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