CVE-2023-50306

Username enumeration via distinguishable account responses

Published Feb 20, 2024 · Updated Aug 2, 2024

Information disclosure in IBM Common Licensing 9.0 allows local users to enumerate usernames through differing responses. The Administration Agent returns distinguishable results for existing and nonexistent usernames; IBM has not disclosed the specific request handler. Local access is required, and the disclosed consequence is limited to determining whether an account name exists.

CVSS severity4.0
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in IBM Common Licensing 9.0 allows local users to enumerate usernames through differing responses. The Administration Agent returns distinguishable results for existing and nonexistent usernames; IBM has not disclosed the specific request handler. Local access is required, and the disclosed consequence is limited to determining whether an account name exists.

The record

CVE
CVE-2023-50306
Published
Feb 20, 2024
Updated
Aug 2, 2024
Vendor
IBM
Product
IBM Common Licensing
Classifications
CWE-204, CWE-203, T1087
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 20, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=9.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

IBM · IBM Common Licensingversion=9.0

Published CVSS scores

3.3NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0IBM CorporationCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-204Observable Response Discrepancy
CWE-203Observable Discrepancy
T1087Account Discovery

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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