# CVE-2026-15571

## Summary

- **CVE ID:** CVE-2026-15571
- **Severity:** HIGH
- **CVSS Score:** 7.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N)
- **CWE:** CWE-341
- **Published:** Aug 18, 2026
- **Last Modified:** Aug 20, 2026

## Description

A flaw was found in the legacy client-initiated account-linking endpoint of Keycloak, a widely used open-source identity and access management solution. The mechanism used to protect the account-linking process from unauthorized requests relies on a hash that can be predicted by a malicious OIDC client. By tricking a user into authenticating, an attacker-controlled client can forge a valid linking URL to connect the victim's account to an attacker's external identity. This results in a full account takeover, allowing the attacker to log in as the victim.

## Affected Products

- Red Hat — Red Hat build of Keycloak 26.6 (26.6-12)
- Red Hat — Red Hat build of Keycloak 26.6 (26.6.6-1)

## References

- [CNA](https://access.redhat.com/errata/RHSA-2026:56523)
- [CNA](https://access.redhat.com/errata/RHSA-2026:56524)
- [CNA](https://access.redhat.com/security/cve/CVE-2026-15571)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2499591)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.33%
- **EPSS Percentile:** 25.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._