CVE-2023-6787

Name: CVE-2023-6787
Creator: NVD / NIST
Published: 2024-04-25T16:15:10.867+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.74%

Last modified Jun 17, 2026

CVE-2023-6787 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 0.74% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.74%

50.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Redhat	Build Of Keycloak	All versions
Redhat	Keycloak	< 22.0.10
Redhat	Keycloak	>= 23.0.0, < 24.0.3

References

https://access.redhat.com/errata/RHSA-2024:1867Vendor Advisory
https://access.redhat.com/errata/RHSA-2024:1868Vendor Advisory
https://access.redhat.com/security/cve/CVE-2023-6787Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2254375Issue Tracking, Vendor Advisory
https://github.com/keycloak/keycloak/security/advisories/GHSA-c9h6-v78w-52wjVendor Advisory
https://access.redhat.com/errata/RHSA-2024:1867Vendor Advisory
https://access.redhat.com/errata/RHSA-2024:1868Vendor Advisory
https://access.redhat.com/security/cve/CVE-2023-6787Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2254375Issue Tracking, Vendor Advisory

Timeline

Published: Apr 25, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2023-6787?

How severe is CVE-2023-6787?

CVE-2023-6787 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.74% probability of exploitation in the next 30 days.

How do I fix CVE-2023-6787?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-6787?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST