CVE-2026-9800: build of keycloak — Fix

Description

A flaw was found in Keycloak Policy Enforcer. This vulnerability allows any authenticated user to bypass all authorization policies, including role, scope, and User-Managed Access (UMA) permission checks. By including the configured access-denied page path within a request URL, either as a path segment or a query parameter, an attacker can gain unauthorized access to protected resources.

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CVSS v3.1 Score

8.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS — Exploit Prediction

0.0031

Probability of exploitation

0.23%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-1025 CWE-1025

Affected Products

Vendor	Product	Versions
redhat	build_of_keycloak	26.4 — 26.4.13
redhat	build_of_keycloak	26.6 — 26.6.4

References

Advisories & Patches

Frequently Asked Questions

What is CVE-2026-9800? +

A flaw was found in Keycloak Policy Enforcer. This vulnerability allows any authenticated user to bypass all authorization policies, including role, scope, and User-Managed Access (UMA) permission checks. By including the configured access-denied page path within a request URL, either as a path segment or a query parameter, an attacker can gain unauthorized access to protected resources. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-9800? +

CVE-2026-9800 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0031, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-9800? +

CVE-2026-9800 affects products from redhat, specifically: build_of_keycloak. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-9800? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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