# CVE-2026-9689

## Summary

- **CVE ID:** CVE-2026-9689
- **Severity:** MEDIUM
- **CVSS Score:** 4.2 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N)
- **CWE:** CWE-1288
- **Published:** May 27, 2026
- **Last Modified:** Aug 20, 2026

## Description

A flaw was found in Keycloak, an open-source identity and access management solution. When a client application is configured to accept broad redirect Uniform Resource Identifiers (URIs), a remote attacker can manipulate the authentication process by crafting a special web address. If a user clicks this link, the client application might incorrectly prioritize attacker-controlled information over legitimate data. This vulnerability, known as HTTP parameter pollution, could allow an attacker to bypass security measures or gain unauthorized access to resources.

## Affected Products

- Red Hat — Red Hat build of Keycloak 26.4 (26.4-22)
- Red Hat — Red Hat build of Keycloak 26.4 (26.4.14-1)
- Red Hat — Red Hat build of Keycloak 26.6 (26.6-11)
- Red Hat — Red Hat build of Keycloak 26.6 (26.6.5-1)

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-9689)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2481845)
- [CNA](https://access.redhat.com/errata/RHSA-2026:50846)
- [CNA](https://access.redhat.com/errata/RHSA-2026:50847)
- [CNA](https://access.redhat.com/errata/RHSA-2026:50848)
- [CNA](https://access.redhat.com/errata/RHSA-2026:50849)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.32%
- **EPSS Percentile:** 25.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._