CVE-2026-33843
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 · uneditedAuthentication bypass using an alternate path or channel in Microsoft Azure Active Directory B2C allows an unauthorized attacker to elevate privileges over a network.
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 confidenceA critical authentication bypass vulnerability in Microsoft Azure Active Directory B2C enables unauthorized attackers to elevate privileges by exploiting an alternate path or channel in the authentication flow. This allows attackers to circumvent normal authentication mechanisms and gain higher-level access than intended.
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 dataall versionsCVSS 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
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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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Confirm Microsoft Entra ID usageReview your tenant configuration in the Microsoft Entra admin center to verify you have an Active Directory B2C tenant or Entra ID tenant deployed. Check the tenant properties for the tenant type.Affected if Your organization uses Microsoft Entra ID (formerly Azure AD) or Azure AD B2C for identity management
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Review conditional access policiesNavigate to Microsoft Entra admin center > Security > Conditional Access. Examine all enabled policies, particularly those granting elevated privileges or access to sensitive applications.Affected if Conditional access policies are absent, misconfigured, or do not require strong authentication for high-privilege operations
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Audit sign-in logs for anomaliesIn Microsoft Entra admin center, go to Monitoring > Sign-in logs. Filter for failed authentication attempts followed by successful ones, unusual IP addresses, or suspicious tenant IDs accessing your resources.Affected if Sign-in logs show authentication patterns indicating bypass attempts, such as inconsistent authentication methods or unexpected privilege escalation events
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Check for unusual privilege modificationsIn Microsoft Entra admin center, navigate to Monitoring > Audit logs. Filter by 'User' and 'Directory' activity categories. Look for role assignments, directory role memberships, or permission changes initiated outside normal business patterns.Affected if Audit logs reveal role assignments or permission changes that were not initiated by authorized administrators
Your environment is affected if you use Microsoft Entra ID or Azure AD B2C and have not hardened conditional access policies or monitored for the specific authentication bypass indicators described in this CVE.
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 dataApply Microsoft security updates for Azure AD B2C when available; in the interim, review and harden authentication policies, enforce MFA, and monitor for unusual privilege escalation activities.
- Consultation8.0 h
- Implementation16.0 h
- Testing12.0 h
- Review / QA8.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $12,352.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-33843 — 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-2026-33843 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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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