EUVD-2026-30888
GHSA-hq3p-w4xv-x7vp
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Lifecycle Timeline
1DescriptionNVD
A flaw was found in Keycloak. A low-privilege user, with knowledge of user credentials and client ID, can bypass a security control intended to disable the implicit flow in OpenID Connect (OIDC) clients. By manipulating client data during a session restart, an attacker can obtain an access token that should not be available. This vulnerability can also lead to the exposure of these access tokens in server logs, proxy logs, and HTTP Referrer headers, resulting in sensitive information disclosure.
AnalysisAI
Implicit flow bypass in Red Hat Build of Keycloak allows a low-privileged authenticated user who already knows another user's credentials and a client ID to obtain OIDC access tokens from clients where the implicit flow was explicitly disabled. Beyond the unauthorized token issuance, the resulting tokens can be written to server logs, proxy logs, and HTTP Referer headers, broadening the disclosure surface. …
Sign in for full analysis, threat intelligence, and remediation guidance.
RemediationAI
24 hours: Identify all Red Hat Build of Keycloak deployments and their versions in production; audit which OAuth/OIDC clients have implicit flow disabled; enable enhanced logging for all authentication events and token issuance. 7 days: While no public exploit has been identified at this time, review logs for evidence of bypass attempts and implement monitoring for suspicious implicit flow requests; contact Red Hat Support for patch availability timeline and interim guidance. …
Sign in for detailed remediation steps.
More from same product – last 7 days
Command injection in the shell-quote npm package allows attackers who can influence object-token inputs to inject arbitr
Heap buffer overflow in NGINX Plus and NGINX Open Source ngx_http_rewrite_module allows unauthenticated remote attackers
Vendor StatusVendor
Share
External POC / Exploit Code
Leaving vuln.today