How severe is CVE-2026-2366?

No CVSS score has been assigned to CVE-2026-2366 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-2366?

CVE-2026-2366 affects the following packages: keycloak (Bitnami). Ecosystems affected: Bitnami.

How do I fix CVE-2026-2366?

Update keycloak to 26.4.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-2366 is resolved across your whole dependency graph.

How do I detect CVE-2026-2366 in my Bitnami dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for keycloak, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-2366 if there is no patch (or I can't update yet)?

Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them.

Is CVE-2026-2366 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-2366 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-2366?

CVE-2026-2366 has an EPSS (Exploit Prediction Scoring System) score of 0.3%, placing it in the 20th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-2366?

CVE-2026-2366 is classified as CWE-639 (CWE-639). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-2366 published, and has it been updated?

CVE-2026-2366 was published on August 25, 2026 and was last updated on September 8, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦 Bitnami

Not in CISA KEV

CVE-2026-2366 — keycloak

CVE-2026-2366 is a CWE-639 vulnerability in keycloak. A fix is available for keycloak — see the affected versions and patch details below.

Keycloak: keycloak: information disclosure via authorization bypass in admin api

Also known asGHSA-r8jr-wg88-fq5c

Published

Aug 25, 2026

Updated

Sep 8, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Oct 30, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-2366.

EPSS Exploitation Probability

via FIRST.org ↗

0.3%probability of exploitation in next 30 days

Lower Risk+0.01%

Lower risk than most CVEs20th percentile — riskier than 20% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

📦keycloak

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Bitnami packages — download data is not available via public APIs for these ecosystems.

Description

A flaw was found in Keycloak. An authorization bypass vulnerability in the Keycloak Admin API allows any authenticated user, even those without administrative privileges, to enumerate the organization memberships of other users. This information disclosure occurs if the attacker knows the victim's unique identifier (UUID) and the Organizations feature is enabled.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦Bitnami	`keycloak`	≥ 26.4.0&&< 26.4.11	26.4.11

Affected Products

1 product · 1 configurations

Application

build of keycloakredhat

≥ 26.4 && < 26.4.11

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for keycloak, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update keycloak to 26.4.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-2366 is resolved across your whole dependency graph.
Workarounds
Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatLow

This LOW impact authorization bypass in the Keycloak Admin API allows an authenticated user to enumerate organization memberships of other users if their UUID is known. This occurs when the Organizations feature is enabled.

Workaround published by Red Hat

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Source: Red Hat security advisory for CVE-2026-2366 (CC BY 4.0)

Product	Fixed in	Advisory
Red Hat build of Keycloak 26.4	`rhbk/keycloak-operator-bundle:26.4.11-1`	RHSA-2026:6478
Red Hat build of Keycloak 26.4.11	`rhbk/keycloak-rhel9`	RHSA-2026:6477

Frequently Asked Questions

O3 Security · Impact-Aware SCA

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