CVE-2023-6787Network attack vector

Account takeover via cross-user session identifier reuse

Published Apr 25, 2024 · Updated Nov 11, 2025

Improper authentication in Keycloak before 22.0.10 and before 24.0.3 allows remote attackers to hijack active user sessions. The re-authentication path retains the prior session identifier when prompt=login is followed by credential entry and Restart login, allowing a session with a different subject to share that identifier. Exploitation requires user interaction with the forced re-authentication flow; successful exploitation grants access under the prior active session.

CVSS severity6.5
Medium
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Keycloak before 22.0.10 and before 24.0.3 allows remote attackers to hijack active user sessions. The re-authentication path retains the prior session identifier when prompt=login is followed by credential entry and Restart login, allowing a session with a different subject to share that identifier. Exploitation requires user interaction with the forced re-authentication flow; successful exploitation grants access under the prior active session.

The record

CVE
CVE-2023-6787
Published
Apr 25, 2024
Updated
Nov 11, 2025
Vendor
Red Hat
Product
Red Hat Single Sign-On 7
Classifications
CWE-287, CWE-613, CWE-384, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 25, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 11, 2025Record 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 privilegesunauthenticated

What is affected?

Red Hat · Red Hat Single Sign-On 7Affected versions are unavailable in this record.
Red Hat · Red Hat build of Keycloak 22Affected versions are unavailable in this record.
Keycloak · Keycloakversion=0 <22.0.10; version=0 <24.0.3

Published CVSS scores

6.5Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
8.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
CWE-613Insufficient Session Expiration
CWE-384Session Fixation
T1190Exploit Public-Facing Application

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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