CVE-2021-20361Network attack vector

Credential disclosure via dynamically constructed href

Published Jul 13, 2021 · Updated Sep 16, 2024

Cross-site scripting in IBM Cloud Pak for Applications 4.3 allows remote authenticated users to expose trusted-session credentials. A dynamically constructed href attribute places user-supplied content into the Web UI without preventing JavaScript execution. Low-privileged access and interaction by another user are required; code then runs within that trusted session and can alter the interface or expose credentials.

CVSS severity5.4
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cross-site scripting in IBM Cloud Pak for Applications 4.3 allows remote authenticated users to expose trusted-session credentials. A dynamically constructed href attribute places user-supplied content into the Web UI without preventing JavaScript execution. Low-privileged access and interaction by another user are required; code then runs within that trusted session and can alter the interface or expose credentials.

The record

CVE
CVE-2021-20361
Published
Jul 13, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
IBM Cloud Pak for Applications
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM Cloud Pak for Applicationsversion=4.3

Published CVSS scores

5.4IBMCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.2IBMCVSS:3.0/AV:N/C:L/S:C/AC:L/I:L/A:N/PR:L/UI:R/E:H/RC:C/RL:O

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo