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CVE-2023-6787

Keycloak: session hijacking via re-authentication

HIGH
8.8
CVSS Score
Published: April 25, 2024 at 04:02 PM UTC
Updated: June 17, 2026 at 06:51 AM UTC
3 products affected across 2 vendorsBuild of KeycloakKeycloakSingle Sign on

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Severity
HIGH8.8
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Keycloak· Keycloak
95%
v < 22.0.1023.0.0 ≤ v < 24.0.3
Affected range stops below 22.0.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 24.0.3, so it looks safe — our inference, not a vendor statement
Build of Keycloak· Red Hatcontainer
95%
All versions
Vendor states this is fixed in 22-13 (unaffected)
Vendor states this is fixed in 22-16 (unaffected)
Vendor states this is fixed in 22.0.10 (unaffected)
Vendor states this is fixed in 22.0.10-1 (unaffected)
Single Sign on· Red Hatrpm
60%
7

References (5)

Vendor Advisoryx_refsource_REDHAT
Source: [email protected]
https://access.redhat.com/errata/RHSA-2024:1867
Vendor Advisoryx_refsource_REDHAT
Source: [email protected]
https://access.redhat.com/errata/RHSA-2024:1868
VDB Entryx_refsource_REDHATVendor Advisory
Source: [email protected]
https://access.redhat.com/security/cve/CVE-2023-6787
Issue Trackingx_refsource_REDHATVendor Advisory
Source: [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=2254375
Vendor Advisory
Source: [email protected]
https://github.com/keycloak/keycloak/security/advisories/GHSA-c9h6-v78w-52wj

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-287

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