Keycloak vulnerable to cross-site scripting (xss) via case-insensitive uri validation bypass

CAO 7.3CVE-2026-9086 · BIT-keycloak-2026-9086 · GHSA-v3f7-2p4r-mwfw · Công bố 25/06/2026 · cập nhật 15/07/2026

Tóm tắt nhanh

CVE-2026-9086 là lỗ hổng mức CAO (CVSS 7.3) ảnh hưởng org.keycloak:keycloak-services, build of keycloak (redhat).
Xác suất bị khai thác trong 30 ngày tới (EPSS): 0.78%, cao hơn 56.0% các lỗ hổng khác.
Cách xử lý: cập nhật lên 26.6.4, 26.4.13 hoặc mới hơn.

Gói / sản phẩm	Phiên bản bị ảnh hưởng	Phiên bản đã vá
org.keycloak:keycloak-services Maven	`< 26.6.4`	`26.6.4`
build of keycloak redhat	`≥ 26.4, < 26.4.13≥ 26.6, < 26.6.4`	`26.4.1326.6.4`

Mô tả

Description

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.

Mô tả của NVD

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.