CVE-2026-4256
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 · uneditedImproper neutralization of special elements used in an LDAP query ('LDAP injection') vulnerability in PEAKUP Technology Inc. PassGate allows LDAP Injection. This issue affects PassGate: through 30042026.
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 confidenceLDAP injection vulnerability in PEAKUP Technology Inc. PassGate allows attackers to manipulate LDAP queries through unsanitized user input. The vulnerability affects versions through 30042026 and stems from improper neutralization of special elements in LDAP query construction.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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
- High
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/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 PassGate installation and versionLocate the PassGate application files and check for version identifiers in installation directories, configuration files, or installed package listingsAffected if PassGate is installed and the version matches or falls within any affected version range (compare your installed version to the affected ranges)
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Verify LDAP authentication is enabledExamine PassGate configuration files (such as config.xml, application.properties, or similar) for LDAP or Active Directory integration settingsAffected if LDAP authentication or directory integration is configured and enabled in PassGate
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Inspect how user credentials are processed for LDAP queriesReview PassGate source code or configuration to trace how user-supplied username and password fields are used when constructing LDAP queriesAffected if User-supplied input (such as login username) is directly concatenated or inserted into LDAP query strings without apparent sanitization
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Check for LDAP input validation or escapingExamine the LDAP query construction code or configuration to determine whether special LDAP characters (such as * ( ) \ NUL) are being escaped or validated before query executionAffected if No proper escaping or input validation for LDAP special characters is found in the query construction logic
A user is affected if PassGate is installed with LDAP authentication enabled and user input is used in LDAP queries without proper sanitization or escaping of special characters.
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 dataImplement proper input validation and escaping of special characters in LDAP query parameters. Use parameterized LDAP queries or established LDAP libraries that handle escaping automatically.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-4256 — 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-2026-4256 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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