CVE-2026-53660 OpenAM Insecure SSO Cookie Initialization
Attackers can steal SSO sessions and force consent grants via CSRF due to insecure cookie defaults in OpenAM.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-53660?
CVE-2026-53660 is a high-severity vulnerability in OpenIdentityPlatform OpenAM, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Open Access Management (OpenAM) is an access management solution. Prior to 16.1.1, the default configuration initializes the iPlanetDirectoryPro SSO cookie with HttpOnly disabled and without a protective SameSite default, and OAuth and OpenID Connect consent flows reuse that cookie through CsrfProtection as a CSRF token. When combined with same-origin cross-site scripting and a user following an attacker-controlled link, the cookie can be read and reused to steal the SSO session and complete attacker-driven consent grants. This issue is fixed in version 16.1.1.
Which versions are affected by CVE-2026-53660?
2 open source packages ship an affected version, including org.openidentityplatform.openam:openam-core.
| Package | Affected | Fixed in |
|---|---|---|
org.openidentityplatform.openam:openam-core Maven | All versions | 16.1.1 |
org.openidentityplatform.openam:openam-core Maven | All versions | 16.1.1 |
How do I fix CVE-2026-53660?
Upgrade org.openidentityplatform.openam:openam-core to 16.1.1 or later.
Is CVE-2026-53660 being exploited?
There is no known exploitation of CVE-2026-53660 in the wild and no public exploit code.
Sources
Also known as GHSA-fpmh-vx4h-xc33, UBUNTU-CVE-2026-53660.