CVE-2026-9986 | Insufficient validation of untrusted input in OptimizationGu… | CVSS 4.2 MEDIUM

Description

Insufficient validation of untrusted input in OptimizationGuide in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to perform UI spoofing via a crafted HTML page. (Chromium security severity: High)

Metadata

CVE ID: CVE-2026-9986
State: PUBLISHED
Assigner: Chrome
Reserved: 2026-05-28 17:25 UTC
Published: 2026-05-28 22:25 UTC
Last updated: 2026-05-29 16:32 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:N/A:L

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
Google	Chrome	—	148.0.7778.216 < 148.0.7778.216

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:N/A:L

References (2)