Origin validation error in Microsoft Edge - CVE-2026-70309

Vulnerability details

The vulnerability allows a remote attacker to bypass a security feature and disclose sensitive information or modify data.

The vulnerability exists due to an origin validation error in Microsoft Edge (Chromium-based) when processing an attacker-controlled webpage. A remote attacker can cause the victim to visit a crafted webpage and perform two tap gestures that activate autofill to bypass a security feature and disclose sensitive information or modify data.

User interaction is required: the victim must visit the attacker-controlled webpage and perform two tap gestures that cause autofill to activate.

Affected software

How to mitigate CVE-2026-70309

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-70309
• https://docs.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Edge