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CVE Record

CVE-2021-20392: IBM QRadar User Behavior Analytics 1.0.0 through 4.0.1 is vulnerable to cross-site scripting.

IBM QRadar User Behavior Analytics 1.0.0 through 4.0.1 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.

MediumCVSS 6.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

IBM QRadar User Behavior Analytics had a web interface flaw that could let an attacker inject JavaScript. If a user interacts with affected content, the script could run inside a trusted QRadar session and potentially expose credentials or alter UI behavior.

Executive priority

Treat this as a moderate-priority security platform issue. It is not evidenced as actively exploited, but QRadar often handles sensitive operational data and trusted credentials, so remediation should be scheduled promptly.

Technical view

CVE-2021-20392 is a network-reachable cross-site scripting issue in IBM QRadar User Behavior Analytics 1.0.0 through 4.0.1. CVSS 3.0 score is 6.1. The source bundle indicates low integrity and confidentiality impact, user interaction required, no availability impact, and changed scope.

Likely exposure

Exposure is most likely where affected QRadar User Behavior Analytics versions are deployed and reachable through the web UI. The bundle has inconsistent affected-product wording, so asset owners should confirm exact UBA versions against IBM’s advisory.

Exploitation context

The bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector includes user interaction required, so practical abuse likely depends on getting a QRadar user to view attacker-controlled content in the UI.

Researcher notes

The provided data identifies XSS and potential credential disclosure but does not include the vulnerable parameter, proof details, or a fixed version. Avoid assuming exploitability beyond the cited CVSS and IBM references.

Mitigation direction

  • Review IBM’s advisory for the official remediation path.
  • Upgrade or remediate affected QRadar UBA deployments per IBM guidance.
  • Restrict QRadar web UI access to trusted administrative users and networks.
  • Monitor QRadar sessions for unexpected UI behavior or credential-related alerts.

Validation and detection

  • Inventory QRadar User Behavior Analytics versions across SIEM environments.
  • Compare deployed versions with IBM’s affected range in the advisory.
  • Confirm the IBM-recommended fix or remediation is installed.
  • Review access controls for QRadar web UI exposure.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-20392 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.1 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/I:L/AC:L/UI:R/PR:N/S:C/AV:N/C:L/A:N/RL:O/E:H/RC:C

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
6.1CVSS 3.0MediumCVSS:3.0/I:L/AC:L/UI:R/PR:N/S:C/AV:N/C:L/A:N/RL:O/E:H/RC:C2.82.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

6.1Medium
CVSS 3.0 vector shape for CVE-2021-20392Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/I:L/AC:L/UI:R/PR:N/S:C/AV:N/C:L/A:N/RL:O/E:H/RC:C

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
IBMQRadar SIEM1.0.0, 4.1.1Listed
Weakness

CWE details

No CWE listed

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