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)

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Google
  • Chrome

No data.

No data.

References
Link Providers
https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html cve-icon cve-icon cve-icon
https://issues.chromium.org/issues/513028160 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-9986 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-9986 cve-icon
History

Fri, 29 May 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 5.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N'}

 ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

cvssV3_1

{'score': 4.2, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L'}

Fri, 29 May 2026 12:15:00 +0000

Type Values Removed Values Added
Title Insufficient Validation in OptimizationGuide Enables UI Spoofing chromium-browser: Insufficient validation of untrusted input in OptimizationGuide
Weaknesses CWE-1289
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N'}

threat_severity

Important

Fri, 29 May 2026 02:30:00 +0000

Type Values Removed Values Added
First Time appeared Google
Google chrome
Vendors & Products Google
Google chrome

Fri, 29 May 2026 01:00:00 +0000

Type Values Removed Values Added
Title Insufficient Validation in OptimizationGuide Enables UI Spoofing

Thu, 28 May 2026 22:45:00 +0000

Type Values Removed Values Added
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)
Weaknesses CWE-20
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Chrome

Published: 2026-05-28T22:25:46.348Z

Updated: 2026-05-29T16:32:48.868Z

Reserved: 2026-05-28T17:25:08.137Z

Link: CVE-2026-9986

cve-icon Vulnrichment

Updated: 2026-05-29T16:32:31.967Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-28T23:16:56.840

Modified: 2026-05-29T02:35:42.620

Link: CVE-2026-9986

cve-icon Redhat

Severity : Important

Publid Date: 2026-05-27T00:00:00Z

Links: CVE-2026-9986 - Bugzilla