SECUFOCUSNOW
Home›CVE index›CVE-2026-7307
Review reviewHigh

CVE-2026-7307

Red Hat Red Hat build of Keycloak 26.2, Red Hat build of Keycloak 26.2.16, Red Hat build of Keycloak 26.4

A flaw was found in Keycloak. A remote, unauthenticated attacker can send a specially crafted XML input to the Security Assertion Markup Language (SAML) endpoint. This malicious input can cause high CPU usage and worker thread starvation, leading to a Denial of Service (DoS) where the server becomes unavailable.

CVSS
7.5
EPSS
0.74%
50.5% percentile
CISA KEV
Not listed
Published
2026.05.19
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.74%
Technical severityCVSS 7.5

Vulnerability overview

A flaw was found in Keycloak. A remote, unauthenticated attacker can send a specially crafted XML input to the Security Assertion Markup Language (SAML) endpoint. This malicious input can cause high CPU usage and worker thread starvation, leading to a Denial of Service (DoS) where the server becomes unavailable.

Affected product and versions

Product
Red Hat Red Hat build of Keycloak 26.2, Red Hat build of Keycloak 26.2.16, Red Hat build of Keycloak 26.4
Affected versions
>= 26.4 < 26.4.12
Fixed versions
26.4.12

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Red Hat Red Hat build of Keycloak 26.2, Red Hat build of Keycloak 26.2.16, Red Hat build of Keycloak 26.4 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-1286