How severe is CVE-2021-20086?

CVE-2021-20086 has a CVSS score of 8.8/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2021-20086?

CVE-2021-20086 affects the following packages: jquery-bbq (npm). Ecosystems affected: npm.

How do I fix CVE-2021-20086?

No patched version of jquery-bbq has shipped for CVE-2021-20086 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

How do I detect CVE-2021-20086 in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for jquery-bbq, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2021-20086 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2021-20086 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2021-20086, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2021-20086?

CVE-2021-20086 has an EPSS (Exploit Prediction Scoring System) score of 6.1%, placing it in the 93th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2021-20086?

CVE-2021-20086 is classified as CWE-1321 (CWE-1321). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Is there exploit tooling available for CVE-2021-20086?

A Nuclei detection template exists for CVE-2021-20086, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2021-20086 published, and has it been updated?

CVE-2021-20086 was published on April 23, 2021 and was last updated on July 8, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦

📦 npm

Not in CISA KEV

HIGH severity

CVE-2021-20086 — jquery-bbq

HIGH

CVE-2021-20086 is a high-severity (CVSS 8.8) CWE-1321 vulnerability in jquery-bbq. 1 public exploit reference exists, so weaponization risk is real. No vendor fix is recorded yet; mitigation options are listed below.

Prototype Pollution in jquery-bbq

Also known asGHSA-7w8j-85wm-6xfq

Published

Apr 23, 2021

Updated

Jul 8, 2026

Affected

1 pkg

Patched

See advisory

Exploits

1 known

Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

6.1%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs93th percentile — riskier than 93% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-20086 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

5other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

jquery-bbqnpm

164downloads / week

Description

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.

Affected Packages

1 total

Ecosystem	Package	Vulnerable range	Fix
📦npm	`jquery-bbq`	all versions	No fix

Affected Products

1 product · 1 configurations

Application

jquery-bbqjquery-bbq_project

1 version

1.2.1

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Improperly Controlled Modification of Object Prototype Attributes ('Prot…

github.comNVDMay 2021

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for jquery-bbq, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
No patched version of jquery-bbq has shipped for CVE-2021-20086 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How to detect CVE-2021-20086

A community-maintained Nuclei template exists for this CVE. You can scan for it directly:

nuclei -id cve-2021-20086 -u https://target

Template: Odoo Apps - Cross-Site Scripting via Prototype Pollution
Severity: high
Impact: Attackers can modify Object.prototype, leading to potential security issues like property overwrites and application behavior manipulation.
Remediation: Update to the latest version of jquery-bbq that addresses this vulnerability or apply patches to prevent prototype pollution.

Template by ProjectDiscovery nuclei-templates (1337rokudenashi), MIT licensed. View the full template. Scan only systems you are authorised to test.

Frequently Asked Questions

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.

O3 Security · Impact-Aware SCA

Is CVE-2021-20086 in your dependencies?

Find it across npm, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

8.8/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Raw vector

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

CWE Classification

Weaponization

Timeline

Disclosed

Apr 23, 2021

First exploit

May 4, 2021

Last updated

Jul 8, 2026

Identifiers

CVE-2021-20086

GHSA-7w8j-85wm-6xfq

References

Advisorysecurity.netapp.com Advisorynvd.nist.gov Websecurity.netapp.com Evidencegithub.com

Related vulnerabilities

This CVE is high severity; 3 of 8 other CVEs with CWE-1321 are rated as high or higher (top: critical).

CVE-2026-61534CVE-2026-86078CVE-2026-84368CVE-2026-85063CVE-2026-84367CVE-2026-82404CVE-2026-63376GHSA-cp6q-959q-f8rhBrowse all CWE-1321

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedJul 8, 2026

CVE-2021-20086 — jquery-bbq

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Remediation status

Mitigate without a patch

How to detect CVE-2021-20086

Frequently Asked Questions

Is CVE-2021-20086 in your dependencies?