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Privacy Statement Third-Party Cookies AcceptRejectManage cookies MSRC  Customer Guidance  Security Update Guide  Vulnerabilities  CVE-2026-50521 Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability NewRecently updated On this page  CVE-2026-50521  Subscribe RSS PowerShell  API  CSAF Security Vulnerability Released: Jun 26, 2026 Last updated: Jul 2, 2026 Assigning CNA Microsoft CVE.org link CVE-2026-50521  Impact Remote Code Execution Max Severity Important Weakness CWE-416: Use After Free CVSS Source Microsoft Vector String CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C Metrics CVSS:3.1 8.3 / 7.2  Base score metrics: 8.3 / Temporal score metrics: 7.2  Expand all  Collapse all Metric Value   Base score metrics(8) Attack Vector Network Attack Complexity Low Privileges Required Low User Interaction None Scope Unchanged Confidentiality High Integrity High Availability Low   Temporal score metrics(3) Exploit Code Maturity Unproven Remediation Level Official Fix Report Confidence Confirmed Please see Common Vulnerability Scoring System for more information on the definition of these metrics. Executive Summary Use after free in Microsoft Edge (Chromium-based) allows an authorized attacker to execute code over a network. Exploitability The following table provides an exploitability assessment for this vulnerability at the time of original publication. Publicly disclosed No Exploited No Exploitability assessment Exploitation Less Likely FAQ There are multiple update packages available for some of the affected software. Do I need to install all the updates listed in the Security Updates table for the software? Yes. Customers should apply all updates offered for the software installed on their systems. According to the CVSS metric, privileges required is low (PR:L). What does that mean for this vulnerability? Any authenticated attacker could trigger this vulnerability. It does not require admin or other elevated privileges. How could an attacker exploit this vulnerability? An attacker could attempt to trick a user into interacting with a malicious request that appears legitimate. When the user approves the request, the attacker could cause the app to obtain an access token on the user’s behalf and send it to a location controlled by the attacker, without the user being clearly informed about what access is being granted. What is the version information for this release? Microsoft Edge Version Date Released Based on Chromium Version 149.0.4022.68 06/14/2026 149.0.7827.103 What is the version information for this release? Microsoft Edge Version Date Released Based on Chromium Version 149.0.4022.67 06/15/2026 149.0.7827.103 According to the CVSS metrics, successful exploitation of this vulnerability could lead to major loss of confidentiality (C:H), and integrity (I:H), and some loss of availability (A:L). What does that mean for this vulnerability? An attacker who successfully exploited this vulnerability could view sensitive information such as other user's credentials (Confidentiality) and make changes to file contents on the target server (Integrity), and they might be able to force a crash within the server (Availability). Acknowledgements sangnt (@gnas0x0018) with Viettel Cyber Security Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgements for more information. Security Updates To determine the support lifecycle for your software, see the Microsoft Support Lifecycle. Release date Descending  Edit columns  Download  Filters  Product Family  Max Severity  Impact  Platform   Clear Release date  Product Platform Impact Max Severity Article Download Build Number Assigning CNA Title: Release date, Content: Jun 26, 2026 Microsoft Edge (Chromium-based) - Remote Code Execution Important Title: Knowledge Base Articles for Microsoft Edge (Chromium-based), Content:, 3 links Release Notes  Release Notes  Release Notes  Title: Download Security Update for Microsoft Edge (Chromium-based), Content:, 3 links Security Update Security Update Security Update Title: Build numbers, Content: 149.0.4022.68 149.0.4022.67 149.0.4022.62 Title: Assigning CNA, Content: Microsoft All results loaded Loaded all 1 rows Disclaimer The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. Revisions version revisionDate description 2.0 Jul 2, 2026 Added Edge software to the Security Updates table. Customers that are running supported version of Edge are encouraged to update to the indicated version to be protected from this vulnerability. 1.0 Jun 26, 2026 Information published.  How satisfied are you with the MSRC Security Update Guide? 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