Google Chrome: Improper input validation in WebShare allows code execution
Summary
Google Chrome versions before 156.0.8078.47 contain an input validation flaw in the WebShare component (CVE-2026-113147, CVSS 8.8). A remote attacker can use a crafted HTML page to potentially execute arbitrary code inside the browser sandbox. The user must visit the malicious page (UI:R), and the sources do not describe a sandbox escape, so the CVSS score may reflect a worst case.
Affected
- Chrome desktop builds before 156.0.8078.47 (Linux)
- Chrome desktop builds before 156.0.8078.47 or .48 (Windows, macOS)
- Chrome for Android before 156.0.8078.47
- Other Chromium-based browsers and applications may be affected until they receive their own updates
Fixed in
- Linux and Android: 156.0.8078.47 or later
- Windows and macOS: 156.0.8078.48 or later
Workaround
Unknown. No workaround is documented in the sources. Updating is the remedy. Until updated, avoid untrusted websites.
Exploitation
- CISA SSVC assessment lists exploitation as 'poc' (proof of concept) and automatable as 'no'
- No evidence of exploitation in the wild was found in the sources
- Inclusion in the CISA KEV catalogue is unverified
Our recommendation
- Update Chrome on all desktops and Android devices to 156.0.8078.47 or later (Windows and macOS: .48 or later)
- Restart the browser after updating
- Check Microsoft Edge and other Chromium-based applications for their own updates
- Monitor the CISA KEV catalogue and the Chromium bug tracker for changes
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
- Microsoft Security Update Guide: CVE-2026-113147 msrc.microsoft.com
- Vulners: NVD record CVE-2026-113147 vulners.com
- Cybersecurity News: Chrome security update fixing 353 flaws cybersecuritynews.com
- TechGeeks: Security notice Google Chrome 156 stable www.techgeeks.org
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 31 Oct 2026, 13:33.
Original description (NVD)
Improper input validation in WebShare in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to potentially execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
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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