CVE-2021-20366

Name: CVE-2021-20366
Creator: NVD / NIST
Published: 2021-07-13T16:15:08.227+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.50%

Last modified Jun 17, 2026

CVE-2021-20366 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. IBM Cloud Pak for Applications 4.3 is vulnerable to cross-site scripting. This vulnerability allows users to embed arbitrary JavaScript code in the Web UI thus altering the intended functionality potentially leading to credentials disclosure within a trusted session. EPSS estimates a 0.50% chance of exploitation in the next 30 days.

Description

IBM Cloud Pak for Applications 4.3 is vulnerable to cross-site scripting. This vulnerability allows users to embed arbitrary JavaScript code in the Web UI thus altering the intended functionality potentially leading to credentials disclosure within a trusted session. IBM X-Force ID: 195037.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.50%

38.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Ibm	Cloud Pak For Applications	< 4.3.1

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/195037VDB Entry
https://www.ibm.com/support/pages/node/6471337Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/195037VDB Entry
https://www.ibm.com/support/pages/node/6471337Vendor Advisory

Timeline

Published: Jul 13, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20366?

How severe is CVE-2021-20366?

CVE-2021-20366 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.50% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20366?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20366?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST