CVE-2026-15571

high Red Hat
CVSS v3 Base Score
7.3
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Published: August 18, 2026 (19 days ago)
Last Modified: August 18, 2026
Vendor: Red Hat
Fix Available: ✓ Yes
Source: REDHAT

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.

CWE

CWE-341

Affected Products

Red Hat Data Grid 8Red Hat JBoss Enterprise Application Platform Expansion PackRed Hat Single Sign-On 7Red Hat build of Keycloak 26.6Red Hat build of Keycloak 26.6.6

Fix Status

✅ Fix Available

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov