KeyCloak Admin Console Host Header Reflected cross site scripting

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability classified as problematic was found in KeyCloak (unknown version). Affected by this vulnerability is an unknown code block of the component Admin Console. The manipulation as part of a Host Header leads to a cross site scripting vulnerability (Reflected). The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

It was found that Keycloak would accept a HOST header URL in the admin console and use it to determine web resource locations. An attacker could use this flaw against an authenticated user to attain reflected XSS via a malicious server.

The bug was discovered 08/01/2017. The weakness was released 10/26/2017 (Website). It is possible to read the advisory at This vulnerability is known as CVE-2017-12158 since 08/01/2017. The attack can be launched remotely. The requirement for exploitation is a single authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 77 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 103956 (RHEL 6 : rh-sso7-keycloak (RHSA-2017:2904)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Red Hat Local Security Checks and running in the context l.

Upgrading eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (103956). Entries connected to this vulnerability are available at 108632 and 108633.




CPE 2.3info

CPE 2.2info


VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.4
NVD Vector: 🔍



VulDB Base Score: 🔍
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Name: Reflected
Class: Cross site scripting / Reflected
CWE: CWE-79 / CWE-74 / CWE-707
ATT&CK: T1059.007

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 103956
Nessus Name: RHEL 6 : rh-sso7-keycloak (RHSA-2017:2904)
Nessus File: 🔍
Nessus Risk: 🔍
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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
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Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍


08/01/2017 🔍
08/01/2017 +0 days 🔍
10/17/2017 +77 days 🔍
10/17/2017 +0 days 🔍
10/19/2017 +2 days 🔍
10/26/2017 +7 days 🔍
10/26/2017 +0 days 🔍
10/27/2017 +1 days 🔍
01/04/2023 +1895 days 🔍


Advisory: RHSA-2017:2904
Researcher: Mykhailo Stadnyk
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-12158 (🔍)
SecurityFocus: 101618 - JBoss KeyCloak CVE-2017-12158 Cross Site Scripting Vulnerability

See also: 🔍


Created: 10/27/2017 09:11 AM
Updated: 01/04/2023 02:46 PM
Changes: 10/27/2017 09:11 AM (67), 11/30/2019 06:01 PM (5), 01/20/2021 06:11 PM (2), 01/04/2023 02:46 PM (3)
Complete: 🔍


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