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5.8

Google Chrome may let sites bypass CORS checks

CVE-2013-6666 · published 12 years ago
Summary

In Chrome versions before 33.0.1750.146, a function handling Flash navigation does not fully verify cross‑origin header rules. This could let a malicious web page bypass normal restrictions and access data from another site. Updating Chrome to the latest version or applying the vendor's patch resolves the risk.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
google chrome <= 33.0.1750.144
33.0.1750.0
33.0.1750.1
33.0.1750.2
33.0.1750.3
33.0.1750.4
33.0.1750.5
33.0.1750.6
33.0.1750.7
33.0.1750.8
33.0.1750.9
33.0.1750.10
94 more version ranges
cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*
Original advisory text
The PepperFlashRendererHost::OnNavigate function in renderer/pepper/pepper_flash_renderer_host.cc in Google Chrome before 33.0.1750.146 does not verify that all headers are Cross-Origin Resource Sh...
The PepperFlashRendererHost::OnNavigate function in renderer/pepper/pepper_flash_renderer_host.cc in Google Chrome before 33.0.1750.146 does not verify that all headers are Cross-Origin Resource Sharing (CORS) simple headers before proceeding with a PPB_Flash.Navigate operation, which might allow remote attackers to bypass intended CORS restrictions via an inappropriate header.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker partial control (estimated)
Severity
5.8 Medium
Exploitation
1% chance of attack within 30 days
Type
CWE-264Permissions, Privileges, and Access Controls
Timeline
Published5 Mar 2014
Updated4 Nov 2026
First seen29 Sep 2026
Sources
CVE-2013-6666 · NVD
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