CVE-2020-4938Network attack vector

Unauthorized actions via forged trusted-user requests

Published Jul 12, 2021 · Updated Sep 17, 2024

Cross-site request forgery in IBM MQ Appliance 9.1 and 9.2 allows remote attackers to submit unauthorized actions through a trusted user. IBM has not disclosed the affected web interface endpoint or the missing request-validation operation. Exploitation requires interaction by a user with an authenticated appliance session, and the documented consequence is unauthorized action with low integrity impact rather than data disclosure or service interruption.

CVSS severity4.3
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in IBM MQ Appliance 9.1 and 9.2 allows remote attackers to submit unauthorized actions through a trusted user. IBM has not disclosed the affected web interface endpoint or the missing request-validation operation. Exploitation requires interaction by a user with an authenticated appliance session, and the documented consequence is unauthorized action with low integrity impact rather than data disclosure or service interruption.

The record

CVE
CVE-2020-4938
Published
Jul 12, 2021
Updated
Sep 17, 2024
Vendor
IBM
Product
IBM MQ Appliance
Classifications
CWE-352, CAPEC-62
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 12, 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=9.1
  2. Affected versionversion=9.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM MQ Applianceversion=9.1; version=9.2

Published CVSS scores

4.3IBMCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
3.8IBMCVSS:3.0/UI:R/S:U/A:N/AC:L/PR:N/I:L/C:N/AV:N/RL:O/RC:C/E:U

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
CAPEC-62Cross Site Request Forgery

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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