CVE-2026-11326: CWE-284 Improper Access Control in OpenAI OpenAI Atlas
OpenAI Atlas versions before 1.2025.288.15 exposed privileged browser APIs to web content on *.openai.com domains. A cross-site scripting vulnerability on forum.openai.com could exploit this exposure to access browser history and control tabs. Version 1.2025.288.15 restricts these APIs to *.chatgpt.com, mitigating the issue. Users should upgrade to this version or later to address the vulnerability.
AI Analysis
Technical Summary
CVE-2026-11326 is an improper access control vulnerability (CWE-284) in OpenAI Atlas prior to version 1.2025.288.15. The product exposed privileged browser APIs to web content on *.openai.com origins, which could be exploited via a cross-site scripting vulnerability on forum.openai.com. This exploitation allows an attacker to access browser history and open or close tabs. The vulnerability is mitigated in version 1.2025.288.15 by narrowing API access to *.chatgpt.com domains.
Potential Impact
An attacker exploiting this vulnerability could gain unauthorized access to sensitive browser functions, including browsing history and tab management, potentially compromising user privacy and session integrity. The CVSS score of 6 indicates a medium severity impact with network attack vector, high complexity, no privileges required, and user interaction needed.
Mitigation Recommendations
Users should upgrade OpenAI Atlas to version 1.2025.288.15 or later, where the access to privileged browser APIs is restricted to *.chatgpt.com domains. Patch status is not explicitly confirmed in the vendor advisory, but the version 1.2025.288.15 is indicated as the fixed version. No additional mitigation steps are specified.
CVE-2026-11326: CWE-284 Improper Access Control in OpenAI OpenAI Atlas
Description
OpenAI Atlas versions before 1.2025.288.15 exposed privileged browser APIs to web content on *.openai.com domains. A cross-site scripting vulnerability on forum.openai.com could exploit this exposure to access browser history and control tabs. Version 1.2025.288.15 restricts these APIs to *.chatgpt.com, mitigating the issue. Users should upgrade to this version or later to address the vulnerability.
CVSS v4.0
Score 6.0medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-11326 is an improper access control vulnerability (CWE-284) in OpenAI Atlas prior to version 1.2025.288.15. The product exposed privileged browser APIs to web content on *.openai.com origins, which could be exploited via a cross-site scripting vulnerability on forum.openai.com. This exploitation allows an attacker to access browser history and open or close tabs. The vulnerability is mitigated in version 1.2025.288.15 by narrowing API access to *.chatgpt.com domains.
Potential Impact
An attacker exploiting this vulnerability could gain unauthorized access to sensitive browser functions, including browsing history and tab management, potentially compromising user privacy and session integrity. The CVSS score of 6 indicates a medium severity impact with network attack vector, high complexity, no privileges required, and user interaction needed.
Mitigation Recommendations
Users should upgrade OpenAI Atlas to version 1.2025.288.15 or later, where the access to privileged browser APIs is restricted to *.chatgpt.com domains. Patch status is not explicitly confirmed in the vendor advisory, but the version 1.2025.288.15 is indicated as the fixed version. No additional mitigation steps are specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- OAI
- Date Reserved
- 2026-06-05T00:07:13.696Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a222773e29bf47b5011e3d3
Added to database: 06/05/2026, 01:33:39 UTC
Last enriched: 06/12/2026, 10:30:17 UTC
Last updated: 07/31/2026, 19:22:57 UTC
Views: 114
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