What’s Vulnerable › Vulnerabilities

CVE-2021-20085

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-04-23 · updated 2026-06-17
• Weakness: CWE-1321

Description

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in backbone-query-parameters 0.4.0 allows a malicious user to inject properties into Object.prototype.

Affected products

• backbone-query-parameters: 0.4.0

References

• https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/backbone-qp.md
• https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/backbone-qp.md

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