# CVE-2026-11326: Security feature bypass in OpenAI Atlas

> An XSS vulnerability in a forum allowed attackers to access privileged browser APIs, exposing history and controlling tabs in OpenAI Atlas.

- **Severity:** Medium 6.0 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/AU:N/V:D/RE:L/U:Green`)
- **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:** No
- **Published:** 5 Jun 2026
- **Updated:** 5 Jun 2026
- **Also known as:** GHSA-x355-jg5j-p4h6

## What is CVE-2026-11326?

CVE-2026-11326 is a medium-severity vulnerability in OpenAI Atlas, published on 5 Jun 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

OpenAI Atlas before 1.2025.288.15 exposed privileged browser APIs to web content on *.openai.com origins. A cross-site scripting vulnerability in forum.openai.com could be used to access these functions, allowing access to browser history information and the ability to open or close tabs. OpenAI Atlas 1.2025.288.15 narrows access to these APIs to *.chatgpt.com; users should upgrade to 1.2025.288.15 or later.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-11326?


## How do I fix CVE-2026-11326?

No fix has been published for CVE-2026-11326 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-11326 being exploited?

There is no known exploitation of CVE-2026-11326 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-11326 and fix it if it is affected.

What it is: CVE-2026-11326 is a medium-severity vulnerability in OpenAI Atlas, published on 5 Jun 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-2026-11326 in the wild and no public exploit code.

Affected product: OpenAI Atlas. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2026-11326/ (Markdown: https://insights.sbomify.com/CVE-2026-11326/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-11326
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-11326
- OSV: https://osv.dev/vulnerability/CVE-2026-11326

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-11326/
Summaries are generated and may contain mistakes; the official description above is the record.