A vulnerability classified as problematic was found in Google Chrome. Affected is an unknown function of the component Extensions. Executing manipulation can lead to improper restriction of rendered ui layers.
This vulnerability is registered as CVE-2025-9866. It is possible to launch the attack remotely. No exploit is available.
Upgrading the affected component is advised.
Intelligence View
⚡ tsecurity.de Intelligence
CVE-2025-9866 | Google Chrome up to 139.0.7258.154 Extensions ui layer (ID 379337 / EUVD-2025-26672)
A vulnerability classified as problematic was found in Google Chrome. Affected is an unknown function of the component Extensions. Executing manipulation can lead to improper restriction of rendered ui layers. This vulnerability is…
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IoC Intelligence (1 Indikatoren)
CVE-2025-9866
CTI Threat Relationship Graph2 Knoten / 1 Relationen
IR-PLAYBOOK-VULN-REMEDIATION
MEDIUMSOC Incident Playbook: Vulnerability Remediation & Verification
1-Click Detection Engineering: Sigma & YARA Rules
SOC Readytitle: Detect Exploitation - CVE-2025-9866 | Google Chrome up to 139.0.7258.154 Extensions ui layer (ID 379337 / EUVD-2025-26672)
id: 40bb9741-ef5a-4ceb-bc9f-6c9dacd6ea19
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
- https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-24
logsource:
category: network_connection
product: any
detection:
selection:
CommandLine|contains:
- 'exploit'
condition: selection
falsepositives:
- Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
- attack.initial_accessrule CTI_Threat_Indicator {
meta:
author = "iShareStuff CTI Automated Detection Engine"
date = "2026-09-24"
description = "YARA Signature for "
strings:
$str = "CVE-2025-9866 | Google Chrome " ascii wide
condition:
any of them
}
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