---
title: "CVE-2026-6647: WSO2 Identity Server - Access Control Bypass"
description: "WSO2 Identity Server with case-insensitive user store and case-sensitive identity database contains an access control bypass caused by inconsistent username case handling, letting attackers with valid tokens bypass token revocation, exploit requires valid access or refresh token with mixed-case username."
url: https://panop.io/threat-heartbeat/CVE-2026-6647/
---

# CVE-2026-6647 WSO2 Identity Server - Access Control Bypass

WSO2 Identity Server with case-insensitive user store and case-sensitive identity database contains an access control bypass caused by inconsistent username case handling, letting attackers with valid tokens bypass token revocation, exploit requires valid access or refresh token with mixed-case username.

CVSS base score 7.4 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-6647)

## Details

Type

Access Control Bypass

Impact

Broken Access Control

CVSS vector

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

Published

28 October 2026

Updated

29 October 2026

Weakness

[CWE-613](https://cwe.mitre.org/data/definitions/613.html)

## Vendor fix

Update to the latest version of WSO2 Identity Server that addresses username case handling inconsistencies.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-6647](https://nvd.nist.gov/vuln/detail/CVE-2026-6647)
- [https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5387/](https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5387/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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