CVE-2026-47426Network attack vectorHinoki check available

OAuth client impersonation via unbound JWKS cache

Published Sep 15, 2026 · Updated Sep 15, 2026

Improper authentication in OpenAM before 16.1.1 allows remote authenticated users to mint OAuth tokens as other registered clients. ClientCredentialsReader reuses a ClientJwksResolverCache entry without binding the cached jwks_uri resolver and verified assertion to the expected client ID. Any registered client with published keys, including one created through open dynamic registration when enabled, can impersonate a jwks_uri client across realms in the same process.

CVSS severity7.1
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper authentication in OpenAM before 16.1.1 allows remote authenticated users to mint OAuth tokens as other registered clients. ClientCredentialsReader reuses a ClientJwksResolverCache entry without binding the cached jwks_uri resolver and verified assertion to the expected client ID. Any registered client with published keys, including one created through open dynamic registration when enabled, can impersonate a jwks_uri client across realms in the same process.

The record

CVE
CVE-2026-47426
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
Open Identity Platform
Product
OpenAM
Classifications
CWE-287, T1550.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 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=< 16.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open Identity Platform · OpenAMversion=< 16.1.1

Published CVSS scores

7.1GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1550.001Use Alternate Authentication Material: Application Access Token

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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