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CVE-2023-6927

Keycloak: open redirect via "form_post.jwt" jarm response mode

4.6 MediumFix available

A flaw was found in Keycloak. This issue may allow an attacker to steal authorization codes or tokens from clients using a wildcard in the JARM response mode "form_post.jwt" which could be used to bypass the security patch implemented to address CVE-2023-6134.

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

1.11%Up 1.0 points since Dec 19, 2023
90%50%10%1%

What each source reports

CVE List Score used 4.6

Keycloak: open redirect via "form_post.jwt" jarm response mode

A flaw was found in Keycloak. This issue may allow an attacker to steal authorization codes or tokens from clients using a wildcard in the JARM response mode "form_post.jwt" which could be used to bypass the security patch implemented to address CVE-2023-6134.

Record
CVE-2023-6927
CVSS 3.1
4.6 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Weakness
CWE-601
Updated
2026-11-02
EUVDEUVD-2024-0318 4.6

A flaw was found in Keycloak. This issue may allow an attacker to steal authorization codes or tokens from clients using a wildcard in the JARM response mode "form_post.jwt" which could be used to bypass the security patch implemented to address CVE-2023-6134.

Record
EUVD-2024-0318
CVSS 3.1
4.6 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-9vm7-v8wj-3fqw 4.6

keycloak-core: open redirect via "form_post.jwt" JARM response mode

An incomplete fix was found in Keycloak Core patch. An attacker can steal authorization codes or tokens from clients using a wildcard in the JARM response mode "form_post.jwt". It is observed that changing the response_mode parameter in the original proof of concept from "form_post" to "form_post.jwt" can bypass the security patch implemented to address CVE-2023-6134.

Record
GHSA-9vm7-v8wj-3fqw
CVSS 3.1
4.6 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Weakness
CWE-601
Updated
2026-11-02
NVD 4.6

A flaw was found in Keycloak. This issue may allow an attacker to steal authorization codes or tokens from clients using a wildcard in the JARM response mode "form_post.jwt" which could be used to bypass the security patch implemented to address CVE-2023-6134.

Record
CVE-2023-6927
CVSS 3.1
4.6 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-601
Updated
2026-11-02
OSV 4.6

Keycloak: open redirect via "form_post.jwt" jarm response mode

A flaw was found in Keycloak. This issue may allow an attacker to steal authorization codes or tokens from clients using a wildcard in the JARM response mode "form_post.jwt" which could be used to bypass the security patch implemented to address CVE-2023-6134.

Record
CVE-2023-6927
CVSS 3.1
4.6 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Weakness
CWE-601
Updated
2026-11-02
OSVGHSA-9vm7-v8wj-3fqw 4.6

keycloak-core: open redirect via "form_post.jwt" JARM response mode

An incomplete fix was found in Keycloak Core patch. An attacker can steal authorization codes or tokens from clients using a wildcard in the JARM response mode "form_post.jwt". It is observed that changing the response_mode parameter in the original proof of concept from "form_post" to "form_post.jwt" can bypass the security patch implemented to address CVE-2023-6134.

Record
GHSA-9vm7-v8wj-3fqw
CVSS 3.1
4.6 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Weakness
CWE-601
Updated
2026-11-02
Show 6 moreShow less
OSVRHSA-2024:0094 7.5

Red Hat Security Advisory: Red Hat Single Sign-On 7.6.6 security update on RHEL 7

Record
RHSA-2024:0094
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVRHSA-2024:0095 7.5

Red Hat Security Advisory: Red Hat Single Sign-On 7.6.6 security update on RHEL 8

Record
RHSA-2024:0095
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVRHSA-2024:0096 7.5

Red Hat Security Advisory: Red Hat Single Sign-On 7.6.6 security update on RHEL 9

Record
RHSA-2024:0096
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVRHSA-2024:0798 7.1

Red Hat Security Advisory: Red Hat Single Sign-On 7.6.7 security update on RHEL 7

Record
RHSA-2024:0798
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Updated
2026-11-02
OSVRHSA-2024:0799 7.1

Red Hat Security Advisory: Red Hat Single Sign-On 7.6.7 security update on RHEL 8

Record
RHSA-2024:0799
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Updated
2026-11-02
OSVRHSA-2024:0800 7.1

Red Hat Security Advisory: Red Hat Single Sign-On 7.6.7 security update on RHEL 9

Record
RHSA-2024:0800
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
org.keycloak:keycloak-core
Maven
 before 23.0.4
23.0.4
org.keycloak:keycloak-core
Maven
 before 23.0.4, 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
23.0.4
rh-sso7-keycloak
Red Hat:red_hat_single_sign_on:7.6::el7
From an advisory covering 2 CVEs
 before 0:18.0.11-3.redhat_00001.1.el7sso
0:18.0.11-3.redhat_00001.1.el7sso
rh-sso7-keycloak-server
Red Hat:red_hat_single_sign_on:7.6::el7
From an advisory covering 2 CVEs
 before 0:18.0.11-3.redhat_00001.1.el7sso
0:18.0.11-3.redhat_00001.1.el7sso
rh-sso7-keycloak
Red Hat:red_hat_single_sign_on:7.6::el8
From an advisory covering 2 CVEs
 before 0:18.0.11-3.redhat_00001.1.el8sso
0:18.0.11-3.redhat_00001.1.el8sso
rh-sso7-keycloak-server
Red Hat:red_hat_single_sign_on:7.6::el8
From an advisory covering 2 CVEs
 before 0:18.0.11-3.redhat_00001.1.el8sso
0:18.0.11-3.redhat_00001.1.el8sso
rh-sso7-keycloak
Red Hat:red_hat_single_sign_on:7.6::el9
From an advisory covering 2 CVEs
 before 0:18.0.11-3.redhat_00001.1.el9sso
0:18.0.11-3.redhat_00001.1.el9sso
rh-sso7-keycloak-server
Red Hat:red_hat_single_sign_on:7.6::el9
From an advisory covering 2 CVEs
 before 0:18.0.11-3.redhat_00001.1.el9sso
0:18.0.11-3.redhat_00001.1.el9sso
rh-sso7-keycloak
Red Hat:red_hat_single_sign_on:7.6::el7
From an advisory covering 8 CVEs
 before 0:18.0.12-1.redhat_00001.1.el7sso
0:18.0.12-1.redhat_00001.1.el7sso
rh-sso7-keycloak-server
Red Hat:red_hat_single_sign_on:7.6::el7
From an advisory covering 8 CVEs
 before 0:18.0.12-1.redhat_00001.1.el7sso
0:18.0.12-1.redhat_00001.1.el7sso
Show 4 moreShow less
Affected packages
PackageAffectedFixed
rh-sso7-keycloak
Red Hat:red_hat_single_sign_on:7.6::el8
From an advisory covering 8 CVEs
 before 0:18.0.12-1.redhat_00001.1.el8sso
0:18.0.12-1.redhat_00001.1.el8sso
rh-sso7-keycloak-server
Red Hat:red_hat_single_sign_on:7.6::el8
From an advisory covering 8 CVEs
 before 0:18.0.12-1.redhat_00001.1.el8sso
0:18.0.12-1.redhat_00001.1.el8sso
rh-sso7-keycloak
Red Hat:red_hat_single_sign_on:7.6::el9
From an advisory covering 8 CVEs
 before 0:18.0.12-1.redhat_00001.1.el9sso
0:18.0.12-1.redhat_00001.1.el9sso
rh-sso7-keycloak-server
Red Hat:red_hat_single_sign_on:7.6::el9
From an advisory covering 8 CVEs
 before 0:18.0.12-1.redhat_00001.1.el9sso
0:18.0.12-1.redhat_00001.1.el9sso

History

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

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

In short

CVE-2023-6927 is a medium vulnerability (CVSS 4.6) in Redhat Keycloak, published December 18, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.11%, the 66th percentile. Fixed in org.keycloak:keycloak-core 23.0.4.

References

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Left out here: 114 versions. The JSON record has them.

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