Google Chrome: Missing authorization in Video component allows origin policy bypass
Summary
Google Chrome versions before 156.0.8078.73 contain a missing authorization flaw in the Video component. A remote attacker can bypass the web origin policy by luring a user to a crafted HTML page. Exploitation requires that the victim visits the page and interacts with it, so it is a drive-by risk for any browsing user.
Affected
- Google Chrome prior to 156.0.8078.73 (desktop)
- Desktop builds for Windows, macOS and Linux; ChromeOS and Chromium-based browsers may be affected as well (unverified)
Fixed in
- Google Chrome 156.0.8078.73 for Linux
- Google Chrome 156.0.8078.73 or 156.0.8078.74 for Windows and macOS
- Fixed in the Stable Channel Update for Desktop of 27 October 2026
Workaround
- Unknown. No vendor-documented mitigation is known; apply the update.
Exploitation
- No evidence of exploitation in the wild found.
- Not listed in CISA KEV according to a third-party aggregator (not verified directly).
- No public proof-of-concept or exploit code found.
- CISA SSVC: exploitation none, automatable no, technical impact partial.
Our recommendation
- Update Google Chrome to 156.0.8078.73 or later (156.0.8078.74 on Windows and macOS) on all desktop endpoints.
- Verify browser versions centrally and enforce a browser restart so the update takes effect.
- Check ChromeOS devices and Chromium-based browsers such as Edge for available fixes, as they may lag behind.
- Treat as high priority for SMEs because Chrome is widely used and the attack is remote and requires no 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
- VulDB CVE-2026-118333 vuldb.com
- Vulners Red Hat CVE record vulners.com
- OffSeq threat radar radar.offseq.com
- Malwarebytes: Chrome and Firefox updates www.malwarebytes.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 31 Oct 2026, 00:33.
Original description (NVD)
Missing authorization in Video in Google Chrome prior to 156.0.8078.73 allowed a remote attacker to bypass web origin policy 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.
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