CVE-2023-6291

highpriority · track · 28EPSS 0.009 · 61 %ileDEEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.95% (61st) EPSS

CVSS 7.1 · high

Is it mine?

29 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-26

A flaw was found in the redirect_uri validation logic in Keycloak. This issue may allow a bypass of otherwise explicitly allowed hosts. A successful attack may lead to an access token being stolen, making it possible for the attacker to impersonate other users.

cvss

Technical severity, 0–10. One row per scoring source.

7.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.5–7.1

v3.17.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Lprimary · NVD / NIST USexploitability 2.8 · impact 3.7

v3.17.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Lsecondary · ENISA EU

v3.17.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Lsecondary · secalert@redhat.com USexploitability 2.8 · impact 3.7

v3.17.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Lsecondary · OSV

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-601USprimaryCWE-20US

affected products (29)

Products and version ranges known to be affected.

Hitachi Ops Centerall versionscert_bundDEcpe:/a:hitachi:ops_center:-
Open Source Keycloakall versionscert_bundDEcpe:/a:keycloak:keycloak:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Red Hat RHEL-8 based Middleware Containers< 7.6-38enisa_euvdEU
Red Hat RHEL-8 based Middleware Containers< 7.6-41enisa_euvdEU
Red Hat RHEL-8 based Middleware Containers< 7.6.6-2enisa_euvdEU
Red Hat Red Hat Single Sign-On 7.6 for RHEL 7< 0:18.0.11-2.redhat_00003.1.el7ssoenisa_euvdEU
Red Hat Red Hat Single Sign-On 7.6 for RHEL 7< 0:18.0.12-1.redhat_00001.1.el7ssoenisa_euvdEU
Red Hat Red Hat Single Sign-On 7.6 for RHEL 8< 0:18.0.11-2.redhat_00003.1.el8ssoenisa_euvdEU
Red Hat Red Hat Single Sign-On 7.6 for RHEL 8< 0:18.0.12-1.redhat_00001.1.el8ssoenisa_euvdEU
Red Hat Red Hat Single Sign-On 7.6 for RHEL 9< 0:18.0.11-2.redhat_00003.1.el9ssoenisa_euvdEU
Red Hat Red Hat Single Sign-On 7.6 for RHEL 9< 0:18.0.12-1.redhat_00001.1.el9ssoenisa_euvdEU
Red Hat Red Hat build of Keycloak 22< 22-6enisa_euvdEU
Red Hat Red Hat build of Keycloak 22< 22-9enisa_euvdEU
Red Hat Red Hat build of Keycloak 22< 22.0.7-1enisa_euvdEU
redhat keycloak< 22.0.7nvdUScpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:*
redhat migration toolkit for applications= 6.0nvdUScpe:2.3:a:redhat:migration_toolkit_for_applications:*:*:*:*:*:*:*:*
redhat migration toolkit for applications= 7.0nvdUScpe:2.3:a:redhat:migration_toolkit_for_applications:*:*:*:*:*:*:*:*
redhat openshift container platform= 4.11nvdUScpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:*
redhat openshift container platform= 4.12nvdUScpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:*

showing 20 of 29

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-3156Keycloak: Mehrere SchwachstellenDeutsch2023-12-14csaf · cert_bundDE
Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Keycloak ausnutzen, um Sicherheitsvorkehrungen zu umgehen oder einen Denial of Service zu verursachen.
GHSA-mpwq-j3xf-7m5wThe redirect_uri validation logic allows for bypassing explicitly allowed hosts that would otherwise be restricted2023-12-21ghsa · osvUS
An issue was found in the redirect_uri validation logic that allows for a bypass of otherwise explicitly allowed hosts. The problem arises in the verifyRedirectUri method, which attempts to enforce rules on user-controllable input, but essentially causes a desynchronization in how Keycloak and browsers interpret URLs. Keycloak, for example, receives "[www%2ekeycloak%2eorg%2fapp%2f:y@example.com](https://www%2ekeycloak%2eorg%2fapp%2f:y@example.com/)" and thinks the authority to be keycloak.org when it is actually example.com. This happens because the validation logic is performed on a URL decoded version, which no longer represents the original input. ### Acknowledgements Karel Knibbe

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd osv NVD CVE.org MITRE

published 2024-01-26modified 2026-09-22

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+2006 more

references (33)

External citations — patches, advisories, analysis.

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