CVE-2023-6787

Keycloak: session hijacking via re-authentication

Description

A flaw was found in Keycloak that occurs from an error in the re-authentication mechanism within org.keycloak.authentication. This flaw allows hijacking an active Keycloak session by triggering a new authentication process with the query parameter "prompt=login," prompting the user to re-enter their credentials. If the user cancels this re-authentication by selecting "Restart login," an account takeover may occur, as the new session, with a different SUB, will possess the same SID as the previous session.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.15%
Vendor Advisory redhat.com Vendor Advisory redhat.com
Affected: Red Hat Red Hat build of Keycloak 22
Affected: Red Hat Red Hat build of Keycloak 22
Affected: Red Hat Red Hat build of Keycloak 22
Affected: Red Hat Red Hat build of Keycloak 22.0.10
Affected: Red Hat Red Hat Single Sign-On 7
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/errata/RHSA-2024:1867 vendor advisory
https://access.redhat.com/errata/RHSA-2024:1868 vendor advisory
https://access.redhat.com/security/cve/CVE-2023-6787 vdb entry
https://bugzilla.redhat.com/show_bug.cgi?id=2254375 issue tracking
https://github.com/keycloak/keycloak/security/advisories/GHSA-c9h6-v78w-52wj

Frequently Asked Questions

What is the severity of CVE-2023-6787?
CVE-2023-6787 has been scored as a medium severity vulnerability.
How to fix CVE-2023-6787?
To fix CVE-2023-6787, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-6787 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-6787 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-6787?
CVE-2023-6787 affects Red Hat Red Hat build of Keycloak 22, Red Hat Red Hat build of Keycloak 22, Red Hat Red Hat build of Keycloak 22, Red Hat Red Hat build of Keycloak 22.0.10, Red Hat Red Hat Single Sign-On 7.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.