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CVE-2026-83711 is a critical authorization-bypass vulnerability in Microsoft Azure Active Directory B2C (Entra ID B2C). The flaw is classified as CWE-639, Authorization Bypass Through User-Controlled Key. An unauthenticated attacker can reportedly manipulate a user-controlled key in an authorization context to bypass intended access controls and elevate privileges remotely over the network.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A CVSS 10.0 elevation-of-privilege vulnerability affecting Microsoft Azure Active Directory B2C. The content describes it as a service-side issue for which Microsoft indicates no customer action is required.
A maximum-severity authorization-bypass-through-user-controlled-key flaw (CWE-639) in Azure Active Directory B2C (Entra ID) that permits unauthenticated remote privilege escalation.
An authorization-bypass vulnerability in Microsoft Azure Active Directory B2C caused by a user-controlled key, enabling an unauthorized network attacker to elevate privileges.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.