CVE-2022-3916Network attack vector

Session takeover via reused offline session identifiers

Published Sep 20, 2023 · Updated Aug 3, 2024

Session takeover in Red Hat Single Sign-On allows remote authenticated users to obtain another user's token through offline refresh. Keycloak reuses an identifier between root and user authentication sessions without validating that the root session belongs to the current user. Exploitation requires an offline_access client, a prior user who leaves cookies on a shared device, and a second user who authenticates before refresh-token use.

CVSS severity6.8
Medium
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Session takeover in Red Hat Single Sign-On allows remote authenticated users to obtain another user's token through offline refresh. Keycloak reuses an identifier between root and user authentication sessions without validating that the root session belongs to the current user. Exploitation requires an offline_access client, a prior user who leaves cookies on a shared device, and a second user who authenticates before refresh-token use.

The record

CVE
CVE-2022-3916
Published
Sep 20, 2023
Updated
Aug 3, 2024
Vendor
Red Hat
Product
RHEL-8 based Middleware Containers
Classifications
CWE-613, T1550.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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?

Red Hat · RHEL-8 based Middleware ContainersAffected versions are unavailable in this record.
Red Hat · Red Hat Single Sign-OnAffected versions are unavailable in this record.

Published CVSS scores

6.8Red HatCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/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-613Insufficient Session Expiration
T1550.001Use Alternate Authentication Material: Application Access Token

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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