Google Chrome: Sandbox escape via improper input validation in Extensions
Summary
Improper input validation in the Extensions component of Google Chrome desktop allows a remote attacker to potentially execute arbitrary code outside the browser sandbox. The attack requires that a victim opens a crafted HTML page, for example via a link in email or chat. NVD rates the vulnerability CVSS 9.6 (critical), while Chromium rates it Low, so the severity should be checked against the vendor's own assessment.
Affected
- Google Chrome desktop (Windows, macOS, Linux) before 156.0.8078.47
- Sources differ on the exact builds for Windows and macOS; treat 156.0.8078.47 as the minimum.
Fixed in
- Google Chrome 156.0.8078.47 or later (Linux)
- Google Chrome 156.0.8078.47 or later, ideally 156.0.8078.48 (Windows, macOS)
- Chromium-based browsers such as Microsoft Edge receive the fix through their own updates.
Workaround
- Unknown. No vendor-published workaround is known; updating Chrome is the required fix.
Exploitation
- Not confirmed as exploited in the wild. CISA KEV status should be checked directly.
- No public proof-of-concept found in the research.
- CISA SSVC assessment: exploitation none, automatable no, technical impact total.
Our recommendation
- Update Chrome on all desktops to 156.0.8078.47 or later and verify the installed version, not only the update prompt.
- Patch Chromium-based browsers such as Microsoft Edge at the same time.
- Check Linux systems that install Chromium as a snap and update the snap separately.
- Enforce automatic updates and restrict which browser extensions may run on managed devices.
- Prioritize workstations with shared use or administrator privileges.
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 issue tracker issues.chromium.org
- Ubuntu security tracker CVE-2026-113023 ubuntu.com
- NVD record as mirrored by Vulners vulners.com
- Cybersecurity News: Chrome security update fixing 353 flaws cybersecuritynews.com
- Windows Forum: Chrome 156 security update windowsforum.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, 22:40.
Original description (NVD)
Improper input validation in Extensions in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Low)
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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