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CVE-2026-18218— Keycloak-services: keycloak-services: client not-before revocation ignored when realm not-before is older but nonzero

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组织开源的一种身份和访问管理解决方案。 Keycloak存在授权问题漏洞，该漏洞源于TokenManager组件在已有较早非零撤销策略时，管理员使用“not-before”策略撤销特定应用令牌的操作可能被静默忽略，导致已颁发令牌在管理员尝试失效后仍可用于刷新会话和访问用户信息。

CVSS 4.2 · Medium EPSS 0.29% · P19

Possible ATT&CK Techniques 1 AI

T1528 · Steal Application Access Token

Affected Version Matrix 9

VendorProduct Version RangeStatus
Red Hat Red Hat build of Keycloak 26.6 26.6.7-3< * unaffected
26.6-20< * unaffected
26.6-20< * unaffected
Red Hat Red Hat build of Keycloak 26.6.7 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-2026-18218

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: client not-before revocation ignored when realm not-before is older but nonzero
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the TokenManager component of the Keycloak identity management service. When an administrator attempts to revoke tokens for a specific application (client) using a "not-before" policy, the revocation may be silently ignored if the overall security realm already has an older, non-zero revocation policy in place. This issue can allow previously issued tokens to remain valid for refreshing sessions and accessing user information even after an administrator has attempted to invalidate them. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Keycloak 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak组织开源的一种身份和访问管理解决方案。 Keycloak存在授权问题漏洞，该漏洞源于TokenManager组件在已有较早非零撤销策略时，管理员使用“not-before”策略撤销特定应用令牌的操作可能被静默忽略，导致已颁发令牌在管理员尝试失效后仍可用于刷新会话和访问用户信息。
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 26.6.7-3 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-20 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-20 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.7 - cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.7 - cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.7 - cpe:/a:redhat:build_keycloak:26.6::el9
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-2026-18218

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III. Intelligence Information for CVE-2026-18218

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Vendor Advisories for CVE-2026-18218 (4)

Same Patch Batch · Red Hat · 2026-07-31 · 14 CVEs total

CVE-2026-10079 8.5 HIGH Stackrox: stackrox: deploy-time policy enforcement and visibility bypass via label injecti
CVE-2026-18141 8.2 HIGH Aap-gateway: aap-gateway: authentication bypass in event-driven ansible via forged http he
CVE-2026-15722 7.5 HIGH 389-ds-base: 389-ds-base: pre-authentication stack buffer overflow in get_ruvelement_from_
CVE-2026-11770 7.5 HIGH 389-ds-base: 389-ds-base: pre-auth ldap filter injection in cleanallruv status check
CVE-2026-18215 6.8 MEDIUM Keycloak-services: keycloak-services: microsoft external access-token exchange bypasses co
CVE-2026-18214 6.8 MEDIUM Keycloak-services: keycloak-services: google external access-token exchange bypasses hoste
CVE-2026-18208 6.5 MEDIUM Keycloak-services: keycloak-services: inactive out-of-audience token introspection leaks s
CVE-2026-18203 6.5 MEDIUM Keycloak-services: keycloak-services: group policy extendchildren matches sibling group pa
CVE-2026-16105 4.9 MEDIUM Keycloak-services: keycloak-services: missing per-role authorization on rolecontainerresou
CVE-2026-18211 4.2 MEDIUM Keycloak-services: keycloak-services: secure-client-uris policy bypass via localhost-prefi
CVE-2026-18206 3.7 LOW Keycloak-services: keycloak-services: client policy source-host wildcard domain matching b
CVE-2026-18217 3.4 LOW Keycloak-services: keycloak-services: saml http-redirect binding response preserves query
CVE-2026-18209 3.4 LOW Keycloak-services: keycloak-services: oidc redirect_uri fragment bypass in http parameter

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.6
Same vendor: Red Hat
Same weakness: CWE-862

V. Comments for CVE-2026-18218

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