CVE-2026-11326

6.0 mediumEPSS 0.2%

Medium (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.

Severity

CVSS 4.0

6.0 medium

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

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 11% of CVEs (scores of 2026-10-31)
CWE: CWE-284
Published: 2026-06-05
Modified: 2026-07-23
Record from: the NVD, synced 2026-10-19

References

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

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