Is CVE-2026-11326 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-11326 being exploited in the wild.

How severe is CVE-2026-11326?

Informational severity, with a CVSS score of 8.8, published 5 June 2026.

Which products and versions are affected?

OpenAI Atlas before 1.2025.288.15.

Is there a fix for CVE-2026-11326?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-11326 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-11326?

Check whether you run OpenAI Atlas at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-11326: OpenAI Atlas privileged API exposure via XSS in forum.openai.com

CVE-2026-11326 · Severity: info · CVSS 8.8 · Published 2026-06-05

OpenAI Atlas, an AI-powered web browser, contained a security flaw that allowed malicious websites to take control of the browser's internal functions. By exploiting a vulnerability on an OpenAI forum page, an attacker could track a user's browsing history, open or close tabs without permission, and steal login tokens for sensitive accounts like GitHub or Facebook. This could lead to full account takeovers of any service the user visits within the Atlas browser.

Vendors: OpenAI.

Quick answers

Is CVE-2026-11326 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-11326 being exploited in the wild.
How severe is CVE-2026-11326?: Informational severity, with a CVSS score of 8.8, published 5 June 2026.
Which products and versions are affected?: OpenAI Atlas before 1.2025.288.15.
Is there a fix for CVE-2026-11326?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-11326 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-11326?: Check whether you run OpenAI Atlas at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

OpenAI Atlas improperly exposed Mojo IPC (Inter-Process Communication) bindings to a broad allowlist of domains, including *.openai.com. A DOM-based XSS vulnerability was identified in forum.openai.com via an unsanitized postMessage listener for the 'pushUrl' action. By chaining this XSS with the exposed Mojo interfaces (specifically the 'kaur1br5' toolset), an attacker could bypass the Same-Origin Policy (SOP). This allows for Universal XSS (UXSS) capabilities, including monitoring navigation URLs in real-time, intercepting OAuth authorization codes, and manipulating browser tabs. The issue was resolved in version 1.2025.288.15 by restricting privileged API access to *.chatgpt.com.

Affected products

OpenAI Atlas before 1.2025.288.15

Timeline

2025-12-02: disclosed: Initial research published by Hacktron AI
2026-06-05: advisory: CVE published to NVD

References

https://www.hacktron.ai/blog/hacking-openai-atlas-browser

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