CVE-2026-11326

Published Jun 5, 2026 CVSS 4.0 · 6 Medium EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

Upgrade to OpenAI Atlas 1.2025.288.15 or later.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Cross‑Site Scripting Allowing Browser History Access and Tab Control in OpenAI Atlas
Type Values Removed Values Added
Metrics cvssV4_0

{'score': 6, 'vector': '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'}

Type Values Removed Values Added
First Time appeared Openai
Openai openai Atlas
Vendors & Products Openai
Openai openai Atlas
Type Values Removed Values Added
Title Cross‑Site Scripting Allowing Browser History Access and Tab Control in OpenAI Atlas
Type Values Removed Values Added
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.
Weaknesses CWE-284
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
OAI
Published
Updated
Jun 5, 2026, 6:32 PM
Reserved
Jun 5, 2026, 12:07 AM
Status
Deferred
Published
Jun 5, 2026, 2:17 AM
Modified
Jul 23, 2026, 7:10 AM