CVE-2026-84185Network attack vector

Cross-tenant impersonation via incorrect JWKSet key binding

Published Sep 3, 2026 · Updated Sep 4, 2026

Improper JWS verification in jwcrypto on affected Red Hat products allows remote authenticated users to impersonate other identities. An incorrect type check in General JSON JWS verification lets any valid JWKSet key satisfy a signature without enforcing its asserted kid. Exploitation requires a signing key already trusted by the set and can cross identity or tenant authorization boundaries.

CVSS severity5.9
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper JWS verification in jwcrypto on affected Red Hat products allows remote authenticated users to impersonate other identities. An incorrect type check in General JSON JWS verification lets any valid JWKSet key satisfy a signature without enforcing its asserted kid. Exploitation requires a signing key already trusted by the set and can cross identity or tenant authorization boundaries.

The record

CVE
CVE-2026-84185
Published
Sep 3, 2026
Updated
Sep 4, 2026
Vendor
389 Directory Server
Product
Red Hat Ansible Automation Platform
Classifications
CWE-347, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

389 Directory Server · Red Hat Ansible Automation PlatformAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

5.9Red HatCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A: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-347Improper Verification of Cryptographic Signature
T1078Valid Accounts

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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