VulnerabilityDeferred

CVE-2026-11326

OpenAI Atlas before 1.2025.288.15 exposed privileged browser APIs to web content on *.openai.com origins.

MEDIUM 6.0EPSS 0.21%

Does this matter?

Lower severity and a low EPSS score (0.21%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 4.0: 6.0 MEDIUMCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.21% probability · 12th percentile
CISA KEV: Not listed
Weakness: CWE-284
Source: 8f4f43ab-ba69-4d92-aa1d-d772184d6fb7

References

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.