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CVE-2026-4634

HIGH · CVSS 7.5 · Modified

Published: 2026-04-02 · Updated: 2026-10-26 · Source: NVD

Stored catalog record

Source record retrieved 2026-10-28T10:18:34.222674+00:00. Scheduled imports handle updates; this page does not assert that the provider was queried just now.

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Vulnerability overview

A flaw was found in Keycloak. An unauthenticated attacker can exploit this vulnerability by sending a specially crafted POST request with an excessively long scope parameter to the OpenID Connect (OIDC) token endpoint. This leads to high resource consumption and prolonged processing times, ultimately resulting in a Denial of Service (DoS) for the Keycloak server.

Patch review priority

Assess exposure and vendor guidance

  • No higher-priority signal is available in the current stored evidence.

FIRST EPSS: 0.63% · percentile 49.8 · score date 2026-10-27.

EPSS estimates probability of exploitation in the next 30 days. It does not measure your exposure or prove exploitation. The elevated threshold is 10%; CISA KEV takes precedence. About FIRST EPSS ↗

Severity and scoring

CVSS score
7.5 · HIGH
CVSS version
3.1
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-1050

CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.

Known exploitation and remediation

Not listed in the CISA catalog retrieved for this record. This does not establish that exploitation has not occurred.

Verify affected versions and patch availability in the vendor advisory before making changes.

Affected products and versions

  • cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:text-only:*:*:*

  • cpe:2.3:a:redhat:build_of_keycloak:26.2:*:*:*:text-only:*:*:*

  • cpe:2.3:a:redhat:build_of_keycloak:26.2.15:*:*:*:text-only:*:*:*

  • cpe:2.3:a:redhat:build_of_keycloak:26.4:*:*:*:text-only:*:*:*

  • cpe:2.3:a:redhat:build_of_keycloak:26.4.11:*:*:*:text-only:*:*:*

These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.

Advisories and references

Explore official sources

Read the official NVD record ↗

Explore the CISA catalog ↗

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