CVE-2021-20524Network attack vector

Credential disclosure via stored Web UI XSS

Published Jul 15, 2021 · Updated Sep 17, 2024

Cross-site scripting in IBM Security Verify Access Docker 10.0.0 allows remote authenticated users to alter Web UI behavior and disclose credentials. The Web UI stores or renders user-supplied JavaScript without adequate neutralization, so a trusted-session victim executes the script. Exploitation requires a high-privilege authenticated user to submit the payload and another user to view the affected page; reported impact is limited to session credential disclosure and interface integrity.

CVSS severity4.8
Medium
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in IBM Security Verify Access Docker 10.0.0 allows remote authenticated users to alter Web UI behavior and disclose credentials. The Web UI stores or renders user-supplied JavaScript without adequate neutralization, so a trusted-session victim executes the script. Exploitation requires a high-privilege authenticated user to submit the payload and another user to view the affected page; reported impact is limited to session credential disclosure and interface integrity.

The record

CVE
CVE-2021-20524
Published
Jul 15, 2021
Updated
Sep 17, 2024
Vendor
IBM
Product
IBM Security Verify Access Docker
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=10.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM Security Verify Access Dockerversion=10.0.0

Published CVSS scores

4.8NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
4.8IBMCVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

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')
T1059.007Command and Scripting Interpreter: JavaScript

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

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Your stack

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