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Vulnerability record · CVE-2023-6787 · published 25 April 2024

CVE-2023-6787: Redhat build of keycloak improper authentication vulnerability

Redhat · Build Of Keycloak

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.

8.8 CVSS 3.1 High EPSS 0.74% · top 47.1% CWE-287 · Improper authentication
8.8CVSS 3.1 base score
0.74%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
9References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2254375 Issue TrackingVendor Advisory
https://github.com/keycloak/keycloak/security/advisories/GHSA-c9h6-v78w-52wj Vendor Advisory
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 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2254375 Issue TrackingVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2023-6787), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.