Google Chrome: Improper input validation in Command component
Summary
Google Chrome before 156.0.8078.73 contains an improper input validation flaw in the Command component. A remote attacker can use a crafted HTML page to potentially execute arbitrary code outside the browser sandbox. The attack requires that a user loads the crafted page. Chromium rates the issue High, while the NVD record gives a CVSS score of 9.6 (Critical).
Affected
- Google Chrome prior to 156.0.8078.73 (desktop)
Fixed in
- Google Chrome 156.0.8078.73 or later, as stated in the vendor advisory of 27 October 2026
Workaround
- No vendor workaround known.
- Make sure automatic updates are not blocked and that users relaunch Chrome after an update.
Exploitation
- No exploitation in the wild known as of the sources reviewed.
- Not listed in CISA KEV according to a third-party tracker.
- No public proof of concept found.
Our recommendation
- Update Chrome to 156.0.8078.73 or later on all endpoints, ideally within the normal browser update cycle and sooner for internet-facing or high-risk user groups.
- Check browser versions on managed devices and make sure users restart Chrome after an update.
- Deploy the full Chrome update, as the same release contains further security fixes.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Chrome Releases: Stable Channel Update for Desktop chromereleases.googleblog.com
- Chromium bug tracker entry issues.chromium.org
- Tenable plugin 372646 www.tenable.com
- Ubuntu security tracker ubuntu.com
- VulDB entry vuldb.com
- OffSeq threat radar radar.offseq.com
- GitHub CVE tracker issue github.com
- Malwarebytes: Chrome and Firefox updates fix serious security flaws www.malwarebytes.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 30 Oct 2026, 21:57.
Original description (NVD)
Improper input validation in Command in Google Chrome prior to 156.0.8078.73 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: High)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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