Google Chrome: Missing authorization in Workers allows site isolation bypass
Summary
Missing authorization in the Workers component of Google Chrome allows a remote attacker to bypass site isolation via a crafted PDF file. The attacker must first have compromised the renderer process, for example with a separate browser exploit, so this is a second-stage flaw. NVD rates it 8.1 (High) under CVSS 3.1, and Chromium rates it as Medium severity.
Affected
- Google Chrome prior to 155.0.8059.39
- Chromium-based browsers and Linux packages that include the affected Chromium code: Unknown, check the respective vendor advisories
Fixed in
- Google Chrome 155.0.8059.39 or later (Windows and Mac: 155.0.8059.39/.40)
- Debian bookworm: 155.0.8059.39-1~deb12u1
- Microsoft Edge: Unknown, not verified
Workaround
No workaround. Install the vendor update.
Exploitation
- No evidence of exploitation in the wild found.
- CISA ADP Vulnrichment does not mark the CVE as known exploited.
- Public proof of concept: none found.
- EPSS: about 0.2% (low).
Our recommendation
- Update Google Chrome to 155.0.8059.39 or later on all workstations and check that auto-updates are working.
- Check Chromium-based browsers such as Microsoft Edge and Linux hosts with Chromium packages for current builds.
- Keep site isolation enabled. This does not fix the flaw but adds a layer of defence.
- Monitor for unusual browser crashes or PDF-related incidents.
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 553118313 issues.chromium.org
- OSV: DEBIAN-CVE-2026-106271 osv.dev
- OpenCVE: CVE-2026-106271 app.opencve.io
- Vulnrichment: CVE-2026-106271 vulners.com
- SUSE CVE: CVE-2026-106271 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, 20:45.
Original description (NVD)
Missing authorization in Workers in Google Chrome prior to 155.0.8059.39 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted PDF file. (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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