CVE-2026-11326 | BDVDB-2026-338196 Detail

OpenAIOpenAI Atlas

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.

Impact#

Per CVSS v4.0: confidentiality impact high, integrity impact none, availability impact none. Attack vector: network.

Weaknesses#

CWE-284 Improper Access Control

References#

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

Exploit#

No public exploit known

History#

Version 12026-06-05Record published in the CVE List.

Published

Published: 2026-06-05
Last modified: 2026-06-05

Vendor information

Vendor: OpenAI
Product: OpenAI Atlas

All OpenAI vulnerabilities

Score

6.0 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 11.8.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Improper Access Control

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 1.2025.288.15
Fixed
1.2025.288.15

Scoring System

CVSS v4.0

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

Metric breakdown
Attack Vector	Network
Attack Complexity	High
Attack Requirements	None
Privileges Required	None
User Interaction	Passive
Vulnerable System Confidentiality	High
Vulnerable System Integrity	None
Vulnerable System Availability	None
Subsequent System Confidentiality	None
Subsequent System Integrity	None
Subsequent System Availability	None

CVSS v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).