CVE-2026-9986CWE-20

Insufficient validation of untrusted input in OptimizationGuide in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the…

Medium · published May 28, 2026

CVSS v3.1
4.2
EPSS
0%
Percentile
12.1
In the wild
Unconfirmed
What it is

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)

The record
Technical detail
CVSS v3.1
4.2 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00223 · 12.1th percentile
Weakness
CWE-20 · Improper Input Validation
Published
2026-05-28T22:25Z
EPSS history
Timeline
  • 28 MAY 22:25Z
    Insufficient validation of untrusted input in OptimizationGuide in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the…
    cvelistv5