CVE-2024-56476
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedIBM TXSeries for Multiplatforms 9.1 and 11.1 could allow an attacker to enumerate usernames due to an observable login attempt response discrepancy.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceIBM TXSeries for Multiplatforms versions 9.1 and 11.1 contain a username enumeration vulnerability where the login response differs between valid and invalid usernames, allowing attackers to discover valid user accounts through repeated authentication attempts.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 9.1= 11.1CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify IBM TXSeries installation and versionLocate the IBM TXSeries for Multiplatforms installation and determine the installed version using product-specific commands or inventory toolsAffected if The installed version is 9.1 or 11.1 specifically (these are the affected versions)
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Verify authentication interface is exposedDetermine whether the TXSeries login/authentication endpoint is network-accessible from external systemsAffected if The authentication interface is accessible to untrusted users or networks
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Compare login responses for valid vs invalid usernamesSubmit authentication attempts using both known-valid and invalid usernames, then compare the error messages, response codes, or timing for differencesAffected if The responses (message content, error codes, or response times) differ between valid and invalid usernames
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Review authentication error handling configurationInspect the TXSeries authentication configuration or application logs to confirm whether error messages are customized per usernameAffected if Custom error messages exist that reveal whether a username is valid
You are affected if IBM TXSeries for Multiplatforms version 9.1 or 11.1 is installed AND its login interface is exposed with differentiated responses between valid and invalid usernames.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataNormalize login error messages and response timing to be identical for both valid and invalid usernames, or implement rate limiting and account lockout policies to prevent automated enumeration attacks.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-56476 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-56476 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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