CVE-2026-12456 | Inappropriate implementation in Extensions in Google Chrome … | CVSS 4.2 MEDIUM

Description

Inappropriate implementation in Extensions in Google Chrome prior to 149.0.7827.155 allowed an attacker who convinced a user to install a malicious extension to bypass same origin policy via a crafted Chrome Extension. (Chromium security severity: High)

Metadata

CVE ID: CVE-2026-12456
State: PUBLISHED
Assigner: Chrome
Reserved: 2026-06-16 19:38 UTC
Published: 2026-06-17 01:38 UTC
Last updated: 2026-06-17 10:56 UTC
Primary CWE: CWE-20
Insufficient validation of untrusted input
Vendor / Product: Google / Chrome
Sources: cve.org · NVD

Severity & Metrics

4.2 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
Google	Chrome	—	149.0.7827.155 < 149.0.7827.155

Weakness (CWE)

CWE	Source	Description
CWE-20	cna	Insufficient validation of untrusted input

CVSS scores (1)

Score	Severity	Version	Source	Vector
4.2	MEDIUM	3.1	adp	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

References (2)