CVE-2026-9086

highpriority · track · 10EPSS 0.008 · 56 %ileexploit · PoCDEEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

0.78% (56th) EPSS

CVSS 7.3 · high

Is it mine?

10 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

A flaw was found in Keycloak. A remote attacker with administrative privileges, specifically those with `manage-client` permission or access to client registration endpoints, could bypass client Uniform Resource Identifier (URI) validation. This is achieved by registering a malicious client with a specially crafted redirect URI using a case-insensitive `javascript:` or `data:` scheme. This Cross-Site Scripting (XSS) vulnerability allows for arbitrary code execution in the Keycloak origin when a victim clicks the crafted link, such as in the logout flow or the Admin Console.

cvss

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

7.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.17.3highCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:Nsecondary · ENISA EU

v3.17.3highCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:Nsecondary · secalert@redhat.com USexploitability 2.1 · impact 5.2

v3.17.3highCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:Nsecondaryexploitability 2.1 · impact 5.2

ssvc

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

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79US

exploits (1)

Public proof-of-concept and weaponised exploit code.

Saku0512/CVE-2026-9086-pocSaku0512/CVE-2026-9086-pocPoC · poc_in_github

affected products (10)

Products and version ranges known to be affected.

Open Source Keycloakall versionscert_bundDEcpe:/a:keycloak:keycloak:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Red Hat Red Hat build of Keycloak 26.4< 26.4-19enisa_euvdEU
Red Hat Red Hat build of Keycloak 26.4< 26.4.13-1enisa_euvdEU
Red Hat Red Hat build of Keycloak 26.6< 26.6-8enisa_euvdEU
Red Hat Red Hat build of Keycloak 26.6< 26.6.4-2enisa_euvdEU
redhat build of keycloak26.4 → 26.4.13nvdUScpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*
redhat build of keycloak26.6 → 26.6.4nvdUScpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*
Bitnami keycloak26.4.0 → 26.4.13osvUSpkg:bitnami/keycloak
Bitnami keycloak26.6.0 → 26.6.4osvUSpkg:bitnami/keycloak

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-2093Keycloak: Mehrere SchwachstellenDeutsch2026-06-25csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Keycloak ausnutzen, um falsche Informationen darzustellen, um Informationen offenzulegen, um einen Cross-Site Scripting Angriff durchzuführen, um Sicherheitsvorkehrungen zu umgehen, und um Dateien zu manipulieren.
BIT-keycloak-2026-9086Keycloak: keycloak: cross-site scripting (xss) via case-insensitive uri validation bypass2026-08-25vendor · osvUS
A flaw was found in Keycloak. A remote attacker with administrative privileges, specifically those with `manage-client` permission or access to client registration endpoints, could bypass client Uniform Resource Identifier (URI) validation. This is achieved by registering a malicious client with a specially crafted redirect URI using a case-insensitive `javascript:` or `data:` scheme. This Cross-Site Scripting (XSS) vulnerability allows for arbitrary code execution in the Keycloak origin when a victim clicks the crafted link, such as in the logout flow or the Admin Console.

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 2026-06-25modified 2026-07-15

references (17)

External citations — patches, advisories, analysis.

scry

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