CVE-2023-28126
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 · uneditedAn authentication bypass vulnerability exists in Avalanche versions 6.3.x and below that could allow an attacker to gain access by exploiting the SetUser method or can exploit the Race Condition in the authentication message.
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 confidenceAuthentication bypass in Avalanche versions 6.3.x and below allows attackers to gain unauthorized access by either exploiting the SetUser method or by exploiting a race condition in the authentication message flow. This is a security boundary bypass affecting the authentication mechanism.
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<= 6.3.4.153CVSS 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
- High
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/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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Determine Ivanti Avalanche installed versionAccess the Avalanche admin console or check the application version through the About/Help section in the web interface, or check the Windows installed programs listAffected if The installed version is 6.3.4.153 or any earlier 6.3.x version
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Verify the version number matches vulnerable rangeCompare your installed version against the vulnerable range: any version <= 6.3.4.153 in the 6.3.x lineAffected if The version falls at or below 6.3.4.153
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Confirm Avalanche web or remote administration interface is accessibleCheck if the Avalanche server is exposing its web-based administration console or remote API endpoints on network ports (typically 80/443 or configured custom ports)Affected if The Avalanche administrative interface is reachable from network locations where untrusted users could attempt authentication
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Check if SetUser method or authentication endpoints are exposedReview firewall rules and network access controls to determine if the Avalanche authentication endpoints are accessible to untrusted networks or the internetAffected if Authentication endpoints are accessible from untrusted network segments or external addresses
You are affected if the installed Ivanti Avalanche version is 6.3.4.153 or any earlier 6.3.x version AND the administrative interface is network-accessible to untrusted users.
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 dataUpgrade Avalanche to a version beyond 6.3.x that includes the patched authentication logic; if immediate patching is not possible, implement additional access controls and monitoring on authentication endpoints.
- Consultation6.0 h
- Implementation12.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,448.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-28126 — 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-2023-28126 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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