CVE-2026-11326: Openai Atlas

Medium severity, CVSS 6.0. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Openai Openai Atlas: before 1.2025.288.15 (fixed in 1.2025.288.15)

Published 2026-06-05. Last modified 2026-07-23.