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CVE-2026-70309— Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability

Quick assessment

Affected
Microsoft Microsoft Edge (Chromium-based)
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

微软 Edge（基于 Chromium 内核）中的源验证（Origin validation）错误，允许未经授权的攻击者通过网络绕过一项安全功能。

CVSS 5.4 · Medium

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 1

VendorProduct Version RangeStatus
Microsoft Microsoft Edge (Chromium-based) 1.0.0.0< 150.0.4078.65 affected
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I. Basic Information for CVE-2026-70309

Vulnerability Information
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Vulnerability Title
Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to bypass a security feature over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Microsoft Edge (Chromium-based) 1.0.0.0 ~ 150.0.4078.65 -

II. Public POCs for CVE-2026-70309

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-70309

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Vendor Advisories for CVE-2026-70309 (1)

Same Patch Batch · Microsoft · 2026-08-28 · 8 CVEs total

CVE-2026-72984 8.8 HIGH Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
CVE-2026-66324 6.5 MEDIUM Microsoft Edge (Chromium-based) Spoofing Vulnerability
CVE-2026-66323 5.4 MEDIUM Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
CVE-2026-62904 5.4 MEDIUM Microsoft Edge (Chromium-based) Information Disclosure Vulnerability
CVE-2026-70331 5.4 MEDIUM Microsoft Edge for iOS Spoofing Vulnerability
CVE-2026-58616 4.4 MEDIUM Copilot Chat (Microsoft Edge) Information Disclosure Vulnerability
CVE-2026-66798 4.3 MEDIUM Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability

IV. Related Vulnerabilities

Same product: Microsoft Edge (Chromium-based)
Same vendor: Microsoft
Same weakness: CWE-346

V. Comments for CVE-2026-70309

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