CVE-2026-80092Network attack vectorHinoki check available

Privilege escalation via untrusted account identifier claims

Published Oct 16, 2026 · Updated Oct 16, 2026

Authentication bypass in Microsoft Identity Web before 4.16.1 allows remote authenticated users to elevate privileges via sign-in data. The web-app sign-in handlers derive uid/utid token-cache identifier claims from front-channel client_info rather than the redeemed token. Exposure involves applications using user sign-in and per-user token acquisition, where inconsistent account identifiers undermine token-cache isolation.

CVSS severityUnavailable
Unscored
EPSS probability0.60%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authentication bypass in Microsoft Identity Web before 4.16.1 allows remote authenticated users to elevate privileges via sign-in data. The web-app sign-in handlers derive uid/utid token-cache identifier claims from front-channel client_info rather than the redeemed token. Exposure involves applications using user sign-in and per-user token acquisition, where inconsistent account identifiers undermine token-cache isolation.

The record

CVE
CVE-2026-80092
Published
Oct 16, 2026
Updated
Oct 16, 2026
Vendor
Microsoft Corporation
Product
Microsoft Identity Web
Classifications
T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0 <4.16.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft Corporation · Microsoft Identity Webversion=1.0.0 <4.16.1

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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