Detections
Analytics

Keycloak x < 26.4.9 / 26.5.x < 26.5.2 Token Exchange Vulnerability

medium Nessus Plugin ID 297527

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Synopsis

The remote host is missing one or more security updates.

Description

The version of Keycloak installed on the remote host is prior to 26.4.9 / 26.5.2 / 26.6.0. It is, therefore, affected by the following Token Exchange vulnerability:
 - A flaw was found in the keycloak-services component of Keycloak. This vulnerability allows the issuance of access and refresh tokens for disabled users, leading to unauthorized use of previously revoked privileges, via a business logic vulnerability in the Token Exchange implementation when a privileged client invokes the token exchange flow. (CVE-2025-14559)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update to KeyCloak Version 26.5.2 or higher

See Also

https://github.com/advisories/GHSA-wv3h-x6c4-r867

https://github.com/keycloak/keycloak/issues/45651

Plugin Details

Severity: Medium

ID: 297527

File Name: keycloak_26_5_2.nasl

Version: 1.2

Type: local

Agent: unix

Family: Misc.

Published: 2/2/2026

Updated: 2/3/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: High

Base Score: 7.7

Temporal Score: 5.7

Vector: CVSS2#AV:N/AC:L/Au:M/C:C/I:C/A:N

CVSS Score Source: CVE-2025-14559

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:keycloak:keycloak

Required KB Items: installed_sw/Keycloak

Exploit Ease: No known exploits are available

Patch Publication Date: 1/21/2026

Vulnerability Publication Date: 1/21/2026

Reference Information

CVE: CVE-2025-14559

IAVB: 2026-B-0023