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CVE-2026-15571— Keycloak-services: keycloak-services: predictable account-linking hash enables account takeover via malicious oidc client

Quick assessment

Affected
Red Hat Red Hat build of Keycloak 26.6
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是Keycloak组织开源的一款身份认证与权限管理平台。 Keycloak 26.6-12之前版本和26.6.6-1之前版本存在加密问题漏洞，该漏洞源于旧版客户端发起的账户链接端点保护机制使用可预测的哈希，可能导致攻击者伪造有效链接URL，造成账户完全接管，允许攻击者以受害者身份登录。

CVSS 7.3 · High EPSS 0.31% · P24

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship

Affected Version Matrix 9

VendorProduct Version RangeStatus
Red Hat Red Hat build of Keycloak 26.6 26.6.6-1< * unaffected
26.6-12< * unaffected
26.6-12< * unaffected
Red Hat Red Hat build of Keycloak 26.6.6 any unaffected
any unaffected
any unaffected
Red Hat Red Hat Data Grid 8 any unaffected
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack any unaffected
Red Hat Red Hat Single Sign-On 7 any unaffected
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I. Basic Information for CVE-2026-15571

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: predictable account-linking hash enables account takeover via malicious oidc client
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the legacy client-initiated account-linking endpoint of Keycloak, a widely used open-source identity and access management solution. The mechanism used to protect the account-linking process from unauthorized requests relies on a hash that can be predicted by a malicious OIDC client. By tricking a user into authenticating, an attacker-controlled client can forge a valid linking URL to connect the victim's account to an attacker's external identity. This results in a full account takeover, allowing the attacker to log in as the victim.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
从可观察状态的可预测
Source: CVE Program / CVE List V5
Vulnerability Title
Keycloak 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak组织开源的一款身份认证与权限管理平台。 Keycloak 26.6-12之前版本和26.6.6-1之前版本存在加密问题漏洞，该漏洞源于旧版客户端发起的账户链接端点保护机制使用可预测的哈希，可能导致攻击者伪造有效链接URL，造成账户完全接管，允许攻击者以受害者身份登录。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat build of Keycloak 26.6 26.6.6-1 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-12 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-12 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.6 - cpe:/a:redhat:build_keycloak:26.6
Red Hat Red Hat build of Keycloak 26.6.6 - cpe:/a:redhat:build_keycloak:26.6
Red Hat Red Hat build of Keycloak 26.6.6 - cpe:/a:redhat:build_keycloak:26.6
Red Hat Red Hat Data Grid 8 - cpe:/a:redhat:jboss_data_grid:8
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack - cpe:/a:redhat:jbosseapxp
Red Hat Red Hat Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-15571

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III. Intelligence Information for CVE-2026-15571

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Vendor Advisories for CVE-2026-15571 (4)

Same Patch Batch · Red Hat · 2026-08-18 · 14 CVEs total

CVE-2026-66780 9.9 CRITICAL Submariner-operator: submariner-operator: flat broker trust model grants every spoke full
CVE-2026-12564 9.6 CRITICAL Automation-controller: automation-controller: kubernetes service account token exfiltratio
CVE-2026-18963 9.1 CRITICAL Keycloak-services: keycloak-services: unauthenticated account takeover via reset-credentia
CVE-2026-66793 8.8 HIGH Governance-policy-addon-controller: governance-policy-addon-controller: arbitrary containe
CVE-2026-75924 8.7 HIGH Managed-serviceaccount: managed-serviceaccount: hub addon-manager clusterrole grants clust
CVE-2026-66783 8.2 HIGH Submariner-operator: submariner-operator: arbitrary image override enables privileged code
CVE-2026-66782 7.8 HIGH Submariner-operator: submariner-operator: broker api bearer token stored cleartext in cr s
CVE-2026-71365 7.7 HIGH Awx: webhook status callback ssrf leaks the git pat
CVE-2026-66781 6.5 MEDIUM Submariner-operator: submariner-operator: ipsec psk stored cleartext in submariner cr spec
CVE-2026-75032 6.3 MEDIUM Bluez: bluez: out-of-bounds read in avrcp parse_media_element and parse_media_folder
CVE-2026-75485 5.5 MEDIUM Must-gather: must-gather: cluster proxy object dumped raw, bypassing inspect redaction of
CVE-2026-73834 5.5 MEDIUM Must-gather: must-gather: embedded secret data in acm wrapper crs collected without redact
CVE-2026-19608 5.3 MEDIUM Keycloak-services: keycloak-services: name-only group claims let same-name groups satisfy

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.6
Same vendor: Red Hat
Same weakness: CWE-341

V. Comments for CVE-2026-15571

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