Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-11800— Org.keycloak:keycloak-services: keycloak: authentication bypass via jwt algorithm confusion

CVSS 8.1 · High EPSS 0.19% · P9
Get alerts for future matching vulnerabilitiesLog in to subscribe

I. Basic Information for CVE-2026-11800

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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
Org.keycloak:keycloak-services: keycloak: authentication bypass via jwt algorithm confusion
Source: NVD (National Vulnerability Database)
Vulnerability Description
A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the attacker to impersonate any federated user linked to the affected Identity Provider, leading to unauthorized access and potential privilege escalation.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
密码学签名的验证不恰当
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
Red HatRed Hat build of Keycloak 26.6 26.6.4-2 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red HatRed Hat build of Keycloak 26.6 26.6-8 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red HatRed Hat build of Keycloak 26.6 26.6-8 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red HatRed Hat build of Keycloak 26.6.4-cpe:/a:redhat:build_keycloak:26.6::el9
Red HatRed Hat Build of Keycloak-cpe:/a:redhat:build_keycloak:
Red HatRed Hat Build of Keycloak-cpe:/a:redhat:build_keycloak:
Red HatRed Hat Data Grid 8-cpe:/a:redhat:jboss_data_grid:8
Red HatRed Hat JBoss Enterprise Application Platform Expansion Pack-cpe:/a:redhat:jbosseapxp
Red HatRed Hat Single Sign-On 7-cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-11800

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-11800

请登录查看更多情报信息。

Other References for CVE-2026-11800 (4)

Same Patch Batch · Red Hat · 2026-06-25 · 13 CVEs total

CVE-2026-129758.5 HIGHApicurio/apicurio-registry: apicurio-registry: unhardened saxparser in content-type detect
CVE-2026-98008.1 HIGHKeycloak: keycloak policy enforcer: authorization bypass via incorrect uri comparison
CVE-2026-90997.7 HIGHKeycloak: group-admin escalation to realm-admin
CVE-2026-129927.4 HIGHApicurio/apicurio-registry: apicurio-registry: ssrf via wsdl4j import dereference in wsdl
CVE-2026-90867.3 HIGHKeycloak: keycloak: cross-site scripting (xss) via case-insensitive uri validation bypass
CVE-2026-130836.9 MEDIUMPen-drive: pen-drive: stored xss via unescaped cluster data in html report
CVE-2026-129936.5 MEDIUMApicurio/apicurio-registry: apicurio-registry: xml entity-expansion denial of service via
CVE-2026-97056.5 MEDIUMKeycloak: keycloak: attacker can re-enable and take over disabled clients via registration
CVE-2026-133186.4 MEDIUMVirt-api-rhel9: kubevirt: kubevirt: ssrf in virt-api port-forward via unvalidated guest-ag
CVE-2026-90834.9 MEDIUMKeycloak: keycloak: information disclosure through arbitrary filesystem path probing
CVE-2026-97994.6 MEDIUMKeycloak: keycloak: unauthorized access to resources via uma permission ticket bypass
CVE-2026-132184.2 MEDIUMKubevirt: kubevirt: symlink following in writetocachedfile allows host file overwrite from

IV. Related Vulnerabilities

Same vendor: Red Hat
Same weakness: CWE-347

V. Comments for CVE-2026-11800

No comments yet

Leave a comment