CVE-2020-10776

Cross-site Scripting in keycloak

4.8 MediumFix available

A flaw was found in Keycloak before version 12.0.0, where it is possible to add unsafe schemes for the redirect_uri parameter. This flaw allows an attacker to perform a Cross-site scripting attack.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: High
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

0.78%Up 0.4 points since Apr 14, 2021

What each source reports

NVD Score used 4.8

A flaw was found in Keycloak before version 12.0.0, where it is possible to add unsafe schemes for the redirect_uri parameter. This flaw allows an attacker to perform a Cross-site scripting attack.

Record: CVE-2020-10776
CVSS 3.1: 4.8 MediumCVSS:3.1/AV:N/AC:L/PR:H/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

CVE List No score

A flaw was found in Keycloak before version 12.0.0, where it is possible to add unsafe schemes for the redirect_uri parameter. This flaw allows an attacker to perform a Cross-site scripting attack.

Record: CVE-2020-10776
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2022-0807 No score

A flaw was found in Keycloak before version 12.0.0, where it is possible to add unsafe schemes for the redirect_uri parameter. This flaw allows an attacker to perform a Cross-site scripting attack.

Record: EUVD-2022-0807
Updated: 2026-11-03

GitHub AdvisoriesGHSA-484q-784p-8m5h 4.8

Cross-site Scripting in keycloak

A flaw was found in Keycloak before version 12.0.0, where it is possible to add unsafe schemes for the redirect_uri parameter. This flaw allows an attacker to perform a Cross-site scripting attack.

Record: GHSA-484q-784p-8m5h
CVSS 3.1: 4.8 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSV 4.8

A flaw was found in Keycloak before version 12.0.0, where it is possible to add unsafe schemes for the redirect_uri parameter. This flaw allows an attacker to perform a Cross-site scripting attack.

Record: CVE-2020-10776
CVSS 3.1: 4.8 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVGHSA-484q-784p-8m5h 4.8

Cross-site Scripting in keycloak

A flaw was found in Keycloak before version 12.0.0, where it is possible to add unsafe schemes for the redirect_uri parameter. This flaw allows an attacker to perform a Cross-site scripting attack.

Record: GHSA-484q-784p-8m5h
CVSS 3.1: 4.8 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSVRHSA-2020:4929 8.1

Red Hat Security Advisory: Red Hat Single Sign-On 7.4.3 security update on RHEL 6

Record: RHSA-2020:4929
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Updated: 2026-11-02

OSVRHSA-2020:4930 8.1

Red Hat Security Advisory: Red Hat Single Sign-On 7.4.3 security update on RHEL 7

Record: RHSA-2020:4930
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Updated: 2026-11-02

OSVRHSA-2020:4932 8.1

Red Hat Security Advisory: Red Hat Single Sign-On 7.4.3 security update on RHEL 8

Record: RHSA-2020:4932
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`org.keycloak:keycloak-server-spi-private` Maven	before 12.0.0	12.0.0
`org.keycloak:keycloak-services` Maven	before 12.0.0	12.0.0
`org.keycloak:keycloak-server-spi-private` Maven	before 12.0.0, plus listed versions 10.0.010.0.110.0.211.0.011.0.1 Show 45 moreShow less 11.0.211.0.32.4.0.CR12.4.0.Final2.5.0.CR12.5.0.Final2.5.1.Final2.5.4.Final2.5.5.Final3.0.0.CR13.0.0.Final3.1.0.CR13.1.0.Final3.2.0.CR13.2.0.Final3.2.1.Final3.3.0.CR13.3.0.CR23.3.0.Final3.4.0.CR13.4.0.Final3.4.1.CR13.4.1.Final3.4.2.Final3.4.3.Final4.0.0.Beta14.0.0.Beta24.0.0.Beta34.0.0.Final4.1.0.Final4.2.0.Final4.2.1.Final4.3.0.Final4.4.0.Final4.5.0.Final4.6.0.Final4.7.0.Final4.8.0.Final4.8.1.Final4.8.2.Final4.8.3.Final5.0.06.0.06.0.17.0.0	12.0.0
`org.keycloak:keycloak-services` Maven	before 12.0.0, plus listed versions 1.0-alpha-11.0-alpha-1-120620131.0-alpha-21.0-alpha-31.0-alpha-4 Show 45 moreShow less 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	12.0.0
`rh-sso7-keycloak` Red Hat:red_hat_single_sign_on:7::el6 From an advisory covering 2 CVEs	before 0:9.0.9-1.redhat_00001.1.el6sso	0:9.0.9-1.redhat_00001.1.el6sso
`rh-sso7-keycloak-server` Red Hat:red_hat_single_sign_on:7::el6 From an advisory covering 2 CVEs	before 0:9.0.9-1.redhat_00001.1.el6sso	0:9.0.9-1.redhat_00001.1.el6sso
`rh-sso7-keycloak` Red Hat:red_hat_single_sign_on:7::el7 From an advisory covering 2 CVEs	before 0:9.0.9-1.redhat_00001.1.el7sso	0:9.0.9-1.redhat_00001.1.el7sso
`rh-sso7-keycloak-server` Red Hat:red_hat_single_sign_on:7::el7 From an advisory covering 2 CVEs	before 0:9.0.9-1.redhat_00001.1.el7sso	0:9.0.9-1.redhat_00001.1.el7sso
`rh-sso7-keycloak` Red Hat:red_hat_single_sign_on:7::el8 From an advisory covering 2 CVEs	before 0:9.0.9-1.redhat_00001.1.el8sso	0:9.0.9-1.redhat_00001.1.el8sso
`rh-sso7-keycloak-server` Red Hat:red_hat_single_sign_on:7::el8 From an advisory covering 2 CVEs	before 0:9.0.9-1.redhat_00001.1.el8sso	0:9.0.9-1.redhat_00001.1.el8sso
`rh-sso7-libunix-dbus-java` Red Hat:red_hat_single_sign_on:7::el8 From an advisory covering 2 CVEs	before 0:0.8.0-2.el8sso	0:0.8.0-2.el8sso
`rh-sso7-libunix-dbus-java-debuginfo` Red Hat:red_hat_single_sign_on:7::el8 From an advisory covering 2 CVEs	before 0:0.8.0-2.el8sso	0:0.8.0-2.el8sso
`rh-sso7-libunix-dbus-java-devel` Red Hat:red_hat_single_sign_on:7::el8 From an advisory covering 2 CVEs	before 0:0.8.0-2.el8sso	0:0.8.0-2.el8sso

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases, products	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2020-10776 is a medium vulnerability (CVSS 4.8) in Keycloak, published November 17, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.78%, the 56th percentile. Fixed in org.keycloak:keycloak-server-spi-private 12.0.0.

References

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This page doesn't list everything

Left out here: 74 versions. The JSON record has them.