CVE-2026-15571 Auth bypass in Red Hat Data Grid 8
Attackers can predict account-linking hashes to forge URLs, enabling full account takeover of victims via malicious OIDC clients in Keycloak.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-15571?
CVE-2026-15571 is a high-severity authentication bypass vulnerability in Red Hat Data Grid 8, published on 18 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-341
Which versions are affected by CVE-2026-15571?
1 open source package ship an affected version, including keycloak.
| Package | Affected | Fixed in |
|---|---|---|
keycloak Bitnami | All versions | 26.7.2 |
How do I fix CVE-2026-15571?
Upgrade keycloak to 26.7.2 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-15571 being exploited?
There is no known exploitation of CVE-2026-15571 in the wild and no public exploit code.
Sources
Also known as BIT-keycloak-2026-15571, GHSA-m639-f4cw-m3hm.