CVE-2021-20086

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in jquery-bbq 1.2.1 allows a malicious user to inject properties into Object.prototype.

CVSS v3.1

8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1

8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0

6.5 MEDIUMAV:N/AC:L/Au:S/C:P/I:P/A:P

EPSS

6.10% chance of exploitation in the next 30 days, 93th percentile

Nuclei

high · CWE-1321

Published

2021-04-23

Updated

2025-11-03

Proof-of-concept exploits (1)

• BlackFan/client-side-prototype-pollution/blob/master/pp/jquery-bbq.md

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-20086.yaml

References

• CVE Record
• NVD entry

Related

• CVE-2021-20083
• CVE-2021-20084
• CVE-2021-20085
• CVE-2021-20087
• CVE-2021-20088
• CVE-2021-20089