---
title: "CVE-2026-90997: Keycloak - Authentication Bypass"
description: "Keycloak contains a replay protection bypass caused by row-count semantic mismatch in stateless mode with MySQL or MariaDB, letting attackers replay single-use security artifacts to gain unauthorized access, exploit requires stateless mode deployment."
url: https://panop.io/threat-heartbeat/CVE-2026-90997/
---

# CVE-2026-90997 Keycloak - Authentication Bypass

Keycloak contains a replay protection bypass caused by row-count semantic mismatch in stateless mode with MySQL or MariaDB, letting attackers replay single-use security artifacts to gain unauthorized access, exploit requires stateless mode deployment.

CVSS base score 7.4 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.40% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90997)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

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

Published

17 September 2026

Updated

15 October 2026

Weakness

[CWE-294](https://cwe.mitre.org/data/definitions/294.html)

## Vendor fix

Update to the latest Keycloak version with the fix for replay protection bypass.

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-2026-90997](https://nvd.nist.gov/vuln/detail/CVE-2026-90997)
- [https://github.com/keycloak/keycloak](https://github.com/keycloak/keycloak)
- [https://access.redhat.com/security/cve/CVE-2026-90997](https://access.redhat.com/security/cve/CVE-2026-90997)
- [https://bugzilla.redhat.com/show\_bug.cgi?id=2533141](https://bugzilla.redhat.com/show_bug.cgi?id=2533141)
- [https://access.redhat.com/security/cve/cve-2026-90997](https://access.redhat.com/security/cve/cve-2026-90997)

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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

Panop answers these inside your environment, for this CVE and every other finding.

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