Google Chrome: Missing authorization in FileSystem API allows origin policy bypass
Summary
Google Chrome versions before 155.0.8059.39 contain a missing authorization flaw in the FileSystem API. A remote attacker who has already compromised the renderer process can bypass web origin policy using a crafted HTML page. The bug is a second-stage issue that requires a separate renderer compromise and user interaction, such as visiting the malicious page.
Affected
- Google Chrome prior to 155.0.8059.39
- Chromium-based browsers (including Microsoft Edge) built on affected Chromium versions; exact fixed Edge build unclear from sources
- Debian chromium packages prior to 155.0.8059.39-1~deb12u1 (bookworm)
Fixed in
- Google Chrome 155.0.8059.39 (Linux) and 155.0.8059.39/.40 (Windows, Mac) per the Stable Channel Update of 6 October 2026
- Later Chrome 155 point releases exist; deploy the latest stable build
- Debian: 155.0.8059.39-1~deb12u1 for bookworm
- Ubuntu: chromium-browser packages not affected; ensure the Chromium snap is current
Workaround
No workaround known. Apply the security update.
Exploitation
- Not marked as known exploited in the sources reviewed (CISA KEV not checked directly)
- No public proof of concept found
- Chromium severity: Medium; CISA SSVC: exploitation none, automatable no, technical impact partial
Our recommendation
- Verify that Chrome and all Chromium-based browsers, including Microsoft Edge, run version 155.0.8059.39 or later, preferably the latest 155 build
- Restart browsers so that pending updates take effect
- Check Linux systems for distribution-provided chromium packages and update them
- Include the update in standard patch cycles; this has lower urgency than actively exploited browser bugs, but should not remain unpatched
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: CVE-2026-106198 ubuntu.com
- Debian OSV: CVE-2026-106198 osv.dev
- Malwarebytes: Update Chrome and ChromeOS www.malwarebytes.com
- CISA ADP Vulnrichment mirror (HOL Guard) hol.org
- OpenCVE: CVE-2026-106198 app.opencve.io
- Vulners: MS:CVE-2026-106198 vulners.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 1 Nov 2026, 16:58.
Original description (NVD)
Missing authorization in FileSystem in Google Chrome prior to 155.0.8059.39 allowed a remote attacker who had compromised the renderer process to bypass web origin policy 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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