CVE-2026-66313

What it is

Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally.

At a glance

Exploitability

Can be exploited locally on the machine without logging in. High risk of data exposure.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-08-04 00:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-23 23:10 UTC Last updatedMost recent change to the record

Details

Published

2026-08-04 00:17 UTC

Last modified

2026-10-23 23:10 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-346

Record status

Analyzed

Affected

• Microsoft Edge Chromium < 151.0.4129.59

Attack profile CVSS 3.1 · 6.8

Attack vector

Local

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

None