CVE-2026-66326: CWE-862: Missing Authorization in Microsoft Microsoft Edge (Chromium-based)
Missing authorization in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
AI Analysis
Technical Summary
CVE-2026-66326 is a missing authorization vulnerability (CWE-862) in Microsoft Edge (Chromium-based) that permits an attacker without privileges to execute code remotely over a network, requiring user interaction. The vulnerability has a CVSS 3.1 base score of 6.5, indicating medium severity. Microsoft has published an official fix for this issue.
Potential Impact
An attacker can execute code remotely on a target system running the affected version of Microsoft Edge without prior authorization, potentially leading to code execution with user interaction. Confidentiality is not impacted, but integrity is highly impacted. Availability is not affected.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. Users and administrators should apply the security update provided by Microsoft as soon as possible to remediate the issue. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66326 for patch details and update instructions.
CVE-2026-66326: CWE-862: Missing Authorization in Microsoft Microsoft Edge (Chromium-based)
Description
Missing authorization in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
CVSS v3.1
Score 6.5medium
Affected software
Microsoft
Microsoft Edge (Chromium-based)
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-66326 is a missing authorization vulnerability (CWE-862) in Microsoft Edge (Chromium-based) that permits an attacker without privileges to execute code remotely over a network, requiring user interaction. The vulnerability has a CVSS 3.1 base score of 6.5, indicating medium severity. Microsoft has published an official fix for this issue.
Potential Impact
An attacker can execute code remotely on a target system running the affected version of Microsoft Edge without prior authorization, potentially leading to code execution with user interaction. Confidentiality is not impacted, but integrity is highly impacted. Availability is not affected.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. Users and administrators should apply the security update provided by Microsoft as soon as possible to remediate the issue. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66326 for patch details and update instructions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-24T18:06:51.296Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66326","vendor":"Microsoft"}]
Threat ID: 6a7121febf32cb7a3462c092
Added to database: 08/03/2026, 23:19:26 UTC
Last enriched: 08/11/2026, 15:06:28 UTC
Last updated: 09/18/2026, 01:04:26 UTC
Views: 58
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.