CVE-2026-107889— Keycloak-services: keycloak-services: stored xss on login page via kcsanitize bypass
Quick assessment
Affected
Red Hat Red Hat Build of Keycloak
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Keycloak 登录主题渲染组件中发现了一个安全漏洞。该问题源于负责清理用户输入的安全过滤器可能被绕过，使得域管理员能够在显示字段中存储恶意脚本。这可能导致访问登录页面的用户浏览器中执行未经授权的 JavaScript 代码，从而引发数据泄露或会话干扰等安全风险。
Possible ATT&CK Techniques 3 AI
T1059 · Command and Scripting Interpreter T1501 T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-107889
Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: stored xss on login page via kcsanitize bypass
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the login theme rendering component of Keycloak. The issue occurs because the security filter responsible for cleaning user input can be bypassed, allowing a realm administrator to store malicious scripts in display fields. This could result in unauthorized JavaScript execution in the browsers of users visiting the login page, potentially leading to data exposure or session interference.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat Build of Keycloak | - |
cpe:/a:redhat:build_keycloak:
|
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| Red Hat | Red Hat Build of Keycloak | - |
cpe:/a:redhat:build_keycloak:
|
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| Red Hat | Red Hat Single Sign-On 7 | - |
cpe:/a:redhat:red_hat_single_sign_on:7
|
|
II. Public POCs for CVE-2026-107889
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2026-107889 (2)
IV. Related Vulnerabilities
Same product: Red Hat Build of Keycloak
-
CVE-2026-107623
Keycloak-services: keycloak-services: oidc dcr read-modify-w -
CVE-2026-107604
Keycloak-services: keycloak-services: view-clients role allo -
CVE-2026-107121
Keycloak-services: keycloak-services: smtp starttls plaintex -
CVE-2026-105305
Keycloak-services: keycloak-services: device authorization g -
CVE-2026-105306
Keycloak-services: keycloak-services: token introspection au
Same vendor: Red Hat
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CVE-2026-107651
Eog: eog: arbitrary code execution via heap buffer overflow -
CVE-2026-89091
Ansible-core: ansible-core: ansible-galaxy collection instal -
CVE-2026-107623
Keycloak-services: keycloak-services: oidc dcr read-modify-w -
CVE-2026-107604
Keycloak-services: keycloak-services: view-clients role allo -
CVE-2026-107565
Luksmeta: incomplete gap-boundary and overlap checks in luks
Same weakness: CWE-79
-
CVE-2026-81929
Ocean Pro Demos <= 1.5.4 and Ocean eComm Treasure Box <= 1.8 -
CVE-2026-107801
Jivejdon through 5.0 Stored XSS via Attachment Upload Conten -
CVE-2026-107800
Jivejdon through 5.0 Stored XSS via Private Short Messages -
CVE-2026-107799
Jivejdon through 5.0 Stored XSS via messageListBody.jsp Foru -
CVE-2026-107797
Jivejdon through 5.0 Reflected XSS via postThread.jsp to and
V. Comments for CVE-2026-107889
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