# 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.

- **Severity:** High 7.4 (`CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **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:** Yes
- **Published:** 15 Sep 2026
- **Updated:** 15 Sep 2026
- **Also known as:** GHSA-fpmh-vx4h-xc33, UBUNTU-CVE-2026-53660

## 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.

Weakness: CWE-1275 (Sensitive Cookie with Improper SameSite Attribute), CWE-1188 (Initialization of a Resource with an Insecure Default), CWE-1004 (Sensitive Cookie Without 'HttpOnly' Flag)

## Which versions are affected by CVE-2026-53660?

2 open source packages ship an affected version, including org.openidentityplatform.openam:openam-core.


| Package | Ecosystem | 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.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-53660 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-53660 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.openidentityplatform.openam:openam-core (Maven): affected all versions; fixed in 16.1.1
- org.openidentityplatform.openam:openam-core (Maven): affected all versions; fixed in 16.1.1

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-53660/ (Markdown: https://insights.sbomify.com/CVE-2026-53660/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-53660
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-53660
- OSV: https://osv.dev/vulnerability/CVE-2026-53660

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-53660/
Summaries are generated and may contain mistakes; the official description above is the record.