Keycloak < 26.6.2 Multiple Vulnerabilities

medium Nessus Plugin ID 316461

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Synopsis

The remote host is affected by multiple vulnerabilities.

Description

Keycloak versions installed prior to 26.6.2 are affected by multiple vulnerabilities, including:

- A flaw was found in Keycloak's redirect URI validation logic. An attacker can bypass validation to redirect users to malicious sites, potentially leading to phishing attacks and credential theft. (CVE-2026-7504)

- A session fixation vulnerability exists in the OIDC login flow. An unauthenticated attacker can pre-create sessions leading to account takeover if a user logs in using the attacker's session. (CVE-2026-7507)

- A flaw was found in Keycloak's SAML endpoint processing. A crafted XML request to the SAML endpoint can cause a denial of service by consuming excessive server resources. (CVE-2026-7307)

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

Solution

Upgrade Keycloak to 26.6.2 or later.

Plugin Details

Severity: Medium

ID: 316461

File Name: keycloak_26_6_2.nasl

Version: 1.3

Type: Local

Agent: unix

Family: Misc.

Published: 5/22/2026

Updated: 6/3/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

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

CVSS Score Source: CVE-2026-7504

CVSS v3

Risk Factor: Medium

Base Score: 4.8

Temporal Score: 4.2

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

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

CVSS Score Source: CVE-2026-37980

Vulnerability Information

CPE: cpe:/a:keycloak:keycloak

Required KB Items: Host/local_checks_enabled, Host/uname, installed_sw/Keycloak

Exploit Ease: No known exploits are available

Patch Publication Date: 5/19/2026

Vulnerability Publication Date: 5/19/2026

Reference Information

CVE: CVE-2026-37978, CVE-2026-37979, CVE-2026-37980, CVE-2026-37981, CVE-2026-37982, CVE-2026-4630, CVE-2026-7307, CVE-2026-7504, CVE-2026-7507, CVE-2026-7571

IAVB: 2026-B-0131

Detections

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