---
id: CVE-2026-78628
title: >-
  The Okta Credential Provider for Windows does not validate a serialized
  credential buffer before interpreting it as a Kerberos logon structure
summary: >-
  The Okta Credential Provider for Windows does not validate a serialized
  credential buffer before interpreting it as a Kerberos logon structure. The
  buffer size and packed string offsets are not checked. Processing a malformed
  buffer can …
severity: medium
cvss: 6
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-20
  - CWE-125
  - CWE-787
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T21:18:21.630'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-78628'
references:
  - url: >-
      https://trust.okta.com/security-advisories/improper-input-validation-in-the-okta-credential-provider-for-windows-cve-2026-78628
    label: psirt@okta.com
tags:
  - nvd
ingestedAt: '2026-10-13T21:58:14.188Z'
---

## Overview

The Okta Credential Provider for Windows does not validate a serialized credential buffer before interpreting it as a Kerberos logon structure. The buffer size and packed string offsets are not checked. Processing a malformed buffer can cause the credential provider process to terminate unexpectedly or lead to out-of-bounds memory reads and writes, which may result in the disclosure of adjacent process memory into local system logs.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.