CVE-2026-97848— Keycloak-services: keycloak-services: protocol mapper with jsontype=json bypasses token sanitization

Quick assessment

Affected

Red Hat Red Hat build of Keycloak 26.4

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.

在开源身份与访问管理解决方案 Keycloak 的令牌清洗逻辑中发现了一个漏洞。当协议映射器被配置为使用 JSON 类型输出结构化声明时，该问题会被触发。原本旨在移除未授权角色映射的安全检查仅针对标准的 Java 映射（Map）对象，无法识别基于 Jackson 库生成的 JSON 对象。这使得攻击者能够将伪造的客户端角色注入到安全令牌中，从而可能导致对受保护资源的未授权访问。

CVSS 6.5 · Medium Updated Nov 06, 2026

Possible ATT&CK Techniques 1 AI

T1558.004 · AS-REP Roasting

Get alerts for future matching vulnerabilities Log in to subscribe

Vulnerability Information

Have questions about the vulnerability? See if Shenlong's analysis helps!

View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title

Keycloak-services: keycloak-services: protocol mapper with jsontype=json bypasses token sanitization

Source: CVE Program / CVE List V5

Vulnerability Description

A flaw was found in the token sanitization logic of Keycloak, an open source identity and access management solution. The issue occurs when a protocol mapper is configured to emit structured claims using the JSON type. The security check designed to remove unauthorized role mappings only looks for standard Java maps and fails to recognize Jackson based JSON objects. This allows an attacker to inject forged client roles into security tokens, which could lead to unauthorized access to protected resources.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

输入验证不恰当

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE
Red Hat	Red Hat build of Keycloak 26.4	26.4-29 ~ *	`cpe:/a:redhat:build_keycloak:26.4::el9`
Red Hat	Red Hat build of Keycloak 26.4	26.4.17-2 ~ *	`cpe:/a:redhat:build_keycloak:26.4::el9`
Red Hat	Red Hat build of Keycloak 26.4	26.4-30 ~ *	`cpe:/a:redhat:build_keycloak:26.4::el9`
Red Hat	Red Hat build of Keycloak 26.6.8	-	`cpe:/a:redhat:build_keycloak:26.6::el9`
Red Hat	Red Hat build of Keycloak 26.6.8	-	`cpe:/a:redhat:build_keycloak:26.6::el9`
Red Hat	Red Hat Single Sign-On 7	-	`cpe:/a:redhat:red_hat_single_sign_on:7`

II. Public POCs for CVE-2026-97848

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-97848

请登录查看更多情报信息。

Other References for CVE-2026-97848 (4)

https://access.redhat.com/security/cve/CVE-2026-97848 vdb-entry x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2540960 issue-tracking x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:95761 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:95760 vendor-advisory x_refsource_REDHAT

https://www.cve.org/CVERecord?id=CVE-2026-97848

Same Patch Batch · Red Hat · 2026-11-06 · 15 CVEs total

CVE-2026-109081	6.8 MEDIUM	Keycloak-services: keycloak-services: injection of roles into realm default-roles via dcr
CVE-2026-19688	6.8 MEDIUM	Keycloak-services: keycloak-services: admin api missing audience check
CVE-2026-123037	6.7 MEDIUM	Ansible-core: user module generate_ssh_key follows a symlinked ~/.ssh enabling local privi
CVE-2026-96547	6.5 MEDIUM	Keycloak-services: keycloak-services: dcr registration-time claim-path gap allows forging
CVE-2026-9797	6.5 MEDIUM	Keycloak: keycloak: privilege escalation via client authentication manipulation by an auth
CVE-2026-107124	6.4 MEDIUM	Keycloak-services: keycloak-services: oidc logout endpoint session fixation via id_token_h
CVE-2026-97367	6.4 MEDIUM	Keycloak-services: keycloak-services: dcr azp and sid claim substitution allows account re
CVE-2026-120749	6.2 MEDIUM	Dbus: dbus-daemon: dbus-daemon aborts (reply_serial != 0) when a broadcast from the driver
CVE-2026-96460	5.4 MEDIUM	Keycloak-services: keycloak-services: indefinite access token renewal via standard token e
CVE-2026-92856	4.9 MEDIUM	Keycloak-services: keycloak-services: saml broker ignores proxyrestriction delegation cons
CVE-2026-121837	4.3 MEDIUM	Quarkus-rest-data-panache: quarkus-rest-data-panache: getter-level @securefield ignored fo
CVE-2026-96447	4.2 MEDIUM	Keycloak-services: keycloak-services: stateless token preferred_username fallback enables
CVE-2026-83493		Distributed-workloads: github actions pinned by mutable tag/branch, including third-party
CVE-2026-83494		Training-operator: pytorchjob validateupdate casts oldjob from newobj, bypassing managedby

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.4

Same vendor: Red Hat

Same weakness: CWE-20