Google Chrome: Incorrect authorization in FileSystem allows sandbox escape
Summary
Google Chrome before 155.0.8059.39 contains an incorrect authorization flaw in its FileSystem component (CWE-863). A remote attacker can use a crafted HTML page, delivered through social engineering, to potentially execute arbitrary code outside the browser sandbox. The CVSS 3.1 base score is 9.6 (Critical); Google rates the issue High.
Affected
- Google Chrome before 155.0.8059.39 (Windows, macOS, Linux)
Fixed in
- Windows and macOS: 155.0.8059.39/.40 or later (per Google's advisory of 6 October 2026)
- Linux: 155.0.8059.39 or later
- Debian: 155.0.8059.39-1~deb12u1 (bookworm), 155.0.8059.39-1~deb13u1 (trixie)
- Later stable builds reported by Malwarebytes: 155.0.8059.79/.80 (Windows, macOS), 155.0.8059.79 (Linux); not verified against the Google advisory
Workaround
- Unknown. No vendor workaround is published; install the update instead.
- Chrome applies the update only after a restart (Relaunch).
Exploitation
- No evidence of exploitation in the wild found.
- CISA SSVC: exploitation none, not automatable, total technical impact.
- Not listed in the CISA KEV catalog according to the sources checked.
- No public proof of concept found; this does not rule one out.
Our recommendation
- Update Google Chrome to the latest stable build on all Windows, macOS and Linux systems.
- Restart the browser on all endpoints so the update takes effect.
- Check Chromium-based browsers and Debian or SUSE packages separately.
- Remind users not to open unexpected links or pages, as the attack requires user interaction.
- Monitor for further Chrome updates, as the release contained many security fixes.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Google Chrome Releases: Stable Channel Update for Desktop chromereleases.googleblog.com
- Chromium bug tracker issues.chromium.org
- Debian tracker via OSV osv.dev
- OpenCVE (NVD and CISA ADP data) app.opencve.io
- Malwarebytes: Chrome update fixes www.malwarebytes.com
- Malwarebytes: later Chrome update www.malwarebytes.com
- VulDB vuldb.com
- GitHub alert (KEV status) github.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, 23:14.
Original description (NVD)
Incorrect authorization in FileSystem in Google Chrome prior to 155.0.8059.39 allowed a remote attacker leveraging social engineering 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.
Affected? We can help.
We check whether your systems are affected, install updates and close the gap – continuously with the System Health Checker if you wish.