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CVE-2018-14655

Keycloak vulnerable to cross-site scripting via the state parameter

4.6 Medium

A flaw was found in Keycloak 3.4.3.Final, 4.0.0.Beta2, 4.3.0.Final. When using 'response_mode=form_post' it is possible to inject arbitrary Javascript-Code via the 'state'-parameter in the authentication URL. This allows an XSS-Attack upon succesfully login.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
Required

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

1.19%Up 0.2 points since Apr 14, 2021
90%50%10%1%

What each source reports

CVE List Score used 4.6

A flaw was found in Keycloak 3.4.3.Final, 4.0.0.Beta2, 4.3.0.Final. When using 'response_mode=form_post' it is possible to inject arbitrary Javascript-Code via the 'state'-parameter in the authentication URL. This allows an XSS-Attack upon succesfully login.

Record
CVE-2018-14655
CVSS 3.0
4.6 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
EUVDEUVD-2022-2302 4.6

A flaw was found in Keycloak 3.4.3.Final, 4.0.0.Beta2, 4.3.0.Final. When using 'response_mode=form_post' it is possible to inject arbitrary Javascript-Code via the 'state'-parameter in the authentication URL. This allows an XSS-Attack upon succesfully login.

Record
EUVD-2022-2302
CVSS 3.0
4.6 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-458h-wv48-fq75 5.4

Keycloak vulnerable to cross-site scripting via the state parameter

A flaw was found in Keycloak 3.4.3.Final, 4.0.0.Beta2, 4.3.0.Final. When using response_mode=form_post it is possible to inject arbitrary Javascript-Code via the 'state'-parameter in the authentication URL. This allows an XSS-Attack upon succesfully login.

Record
GHSA-458h-wv48-fq75
CVSS 3.0
5.4 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
NVD 4.6

A flaw was found in Keycloak 3.4.3.Final, 4.0.0.Beta2, 4.3.0.Final. When using 'response_mode=form_post' it is possible to inject arbitrary Javascript-Code via the 'state'-parameter in the authentication URL. This allows an XSS-Attack upon succesfully login.

Record
CVE-2018-14655
CVSS 3.0
4.6 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
CVSS 3.0
5.4 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0
3.5 LowAV:N/AC:M/Au:S/C:N/I:P/A:N
Weakness
CWE-79
Updated
2026-11-02
OSV 5.4

A flaw was found in Keycloak 3.4.3.Final, 4.0.0.Beta2, 4.3.0.Final. When using 'response_mode=form_post' it is possible to inject arbitrary Javascript-Code via the 'state'-parameter in the authentication URL. This allows an XSS-Attack upon succesfully login.

Record
CVE-2018-14655
CVSS 3.0
5.4 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-02
OSVGHSA-458h-wv48-fq75 5.4

Keycloak vulnerable to cross-site scripting via the state parameter

A flaw was found in Keycloak 3.4.3.Final, 4.0.0.Beta2, 4.3.0.Final. When using response_mode=form_post it is possible to inject arbitrary Javascript-Code via the 'state'-parameter in the authentication URL. This allows an XSS-Attack upon succesfully login.

Record
GHSA-458h-wv48-fq75
CVSS 3.0
5.4 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
OSVRHSA-2018:3592 6.1

Red Hat Security Advisory: Red Hat Single Sign-On 7.2.5 on RHEL 6 security and bug fix update

Record
RHSA-2018:3592
CVSS 3.0
6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-02
OSVRHSA-2018:3593 6.1

Red Hat Security Advisory: Red Hat Single Sign-On 7.2.5 on RHEL 7 security and bug fix update

Record
RHSA-2018:3593
CVSS 3.0
6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
org.keycloak:keycloak-parent
Maven
 through 3.4.3.Final None known
org.keycloak:keycloak-parent
Maven
 4.0.0.Beta1 to 4.0.0.Beta2 None known
org.keycloak:keycloak-parent
Maven
 4.3.0.Final to 4.3.0.Final None known
org.keycloak:keycloak-parent
Maven
 through 3.4.3.Final, plus listed versions
1.0-alpha-11.0-alpha-1-120620131.0-alpha-21.0-alpha-31.0-alpha-4
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1.0-beta-11.0-beta-1-201505211.0-beta-1-201505231.0-beta-21.0-beta-31.0-beta-41.0-final1.0-rc-11.0-rc-21.0.1.Final1.0.2.Final1.0.3.Final1.0.4.Final1.0.5.Final1.1.0.Beta11.1.0.Beta21.1.0.Final1.1.1.Final1.2.0.Beta11.2.0.CR11.2.0.Final1.3.0.Final1.3.1.Final1.4.0.Final1.5.0-Final1.5.0.Final1.5.1.Final1.6.0.Final1.6.1.Final1.7.0.CR11.7.0.Final1.8.0.Alpha11.8.0.CR11.8.0.CR21.8.0.CR31.8.0.Final1.8.1.Final1.9.0.CR11.9.0.Final1.9.1.Final1.9.2.Final1.9.3.Final1.9.4.Final1.9.5.Final1.9.7.Final
 None known
org.keycloak:keycloak-parent
Maven
 Listed versions
4.3.0.Final
 None known
rh-sso7-keycloak
Red Hat:red_hat_single_sign_on:7::el6
From an advisory covering 5 CVEs
 before 0:3.4.14-1.Final_redhat_00001.1.jbcs.el6
0:3.4.14-1.Final_redhat_00001.1.jbcs.el6
rh-sso7-keycloak-server
Red Hat:red_hat_single_sign_on:7::el6
From an advisory covering 5 CVEs
 before 0:3.4.14-1.Final_redhat_00001.1.jbcs.el6
0:3.4.14-1.Final_redhat_00001.1.jbcs.el6
rh-sso7-keycloak
Red Hat:red_hat_single_sign_on:7::el7
From an advisory covering 5 CVEs
 before 0:3.4.14-1.Final_redhat_00001.1.jbcs.el7
0:3.4.14-1.Final_redhat_00001.1.jbcs.el7
rh-sso7-keycloak-server
Red Hat:red_hat_single_sign_on:7::el7
From an advisory covering 5 CVEs
 before 0:3.4.14-1.Final_redhat_00001.1.jbcs.el7
0:3.4.14-1.Final_redhat_00001.1.jbcs.el7

History

History
RecordedChangedSources
affected, facts
aliases, productsEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-14655 is a medium vulnerability (CVSS 4.6) in Keycloak, published November 13, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.19%, the 68th percentile. No source names a fixed version.

References

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Left out here: 32 versions. The JSON record has them.

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