What is CVE-2021-20088?

CVE-2021-20088 is a high-severity vulnerability in Mootools Mootools-More, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 8.8/10. Published 2021-04-23.

How severe is CVE-2021-20088?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2021-20088 known to be exploited?

5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Prototype Pollution in Mootools Mootools-More

CVE-2021-20088

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in mootools-more 1.6.0 allows a malicious user to inject properties into Object.prototype.

Vulnerability class: Prototype Pollution

EPSS: 0.014 (70.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mootools Mootools-more — versions 1.6.0
N/a Mootools-more — versions 1.6.0

Weakness classification (CWE)

CWE-1321 — Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

Public proof-of-concept exploits

References

vulnreport@tenable.com (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-20088?: CVE-2021-20088 is a high-severity vulnerability in Mootools Mootools-More, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 8.8/10. Published 2021-04-23.
How severe is CVE-2021-20088?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2021-20088 known to be exploited?: 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.