What’s Vulnerable › Vulnerabilities

CVE-2021-23543: Sandbox Bypass

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-01-10 · updated 2026-06-17
• Weakness: CWE-1321

Description

All versions of package realms-shim are vulnerable to Sandbox Bypass via a Prototype Pollution attack vector.

Affected products

• realms-shim: all versions

References

• https://snyk.io/vuln/SNYK-JS-REALMSSHIM-2309908
• https://www.npmjs.com/package/realms-shim
• https://snyk.io/vuln/SNYK-JS-REALMSSHIM-2309908
• https://www.npmjs.com/package/realms-shim

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