CVE-2026-70309: CWE-346: Origin Validation Error in Microsoft Microsoft Edge (Chromium-based)
Description
CVE-2026-70309 is a medium severity origin validation error vulnerability in Microsoft Edge (Chromium-based). It allows an unauthorized attacker to bypass a security feature over a network. The vulnerability has a CVSS score of 5.4. An official fix is available to address this issue.
CVSS v3.1
Score 5.4medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-70309 is an origin validation error vulnerability (CWE-346) in Microsoft Edge (Chromium-based) that enables an attacker to bypass a security feature remotely. This issue affects version 1.0.0.0 of the product. The vulnerability has been assigned a CVSS 3.1 base score of 5.4, indicating medium severity. Microsoft has released an official fix to remediate this vulnerability.
Potential Impact
An attacker can bypass security features in Microsoft Edge (Chromium-based) remotely, potentially leading to limited confidentiality and integrity impacts. The vulnerability does not affect availability and requires user interaction. No known exploits are reported in the wild.
Mitigation Recommendations
An official fix is available for this vulnerability. Users and administrators should apply the provided patch from Microsoft to remediate the issue. Since the fix is official, no additional mitigation steps are required.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-j3c8-38vp-j837
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-70309"]
- Database Specific Severity
- MODERATE
- Cvss Version
- 3.1
- Remediation Level
- official-fix
- State
- PUBLISHED
Threat ID: 6a92f7f2acd9273b49e7e1ad
Added to database: 08/29/2026, 15:17:06 UTC
Last enriched: 10/08/2026, 22:44:50 UTC
Last updated: 10/13/2026, 18:48:23 UTC
Views: 29
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