{"cve":"CVE-2009-2816","nvd":{"published":"2009-11-13T15:30:00.563","modified":"2026-06-16T23:10:16.840","status":"Modified","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.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-352"],"references":["http://lists.apple.com/archives/security-announce/2009/Nov/msg00001.html","http://lists.apple.com/archives/security-announce/2010/Jun/msg00003.html","http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00006.html","http://osvdb.org/59940","http://osvdb.org/59967"],"products":["apple:iphone_os","apple:safari","fedoraproject:fedora","google:chrome","opensuse:opensuse"],"source":"nvd","synced_at":"2026-10-19T19:54:26.868835795+00:00"},"epss":{"cve":"CVE-2009-2816","score":0.01553,"percentile":0.75131,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}