{"api_version":"1","generated_at":"2026-04-22T22:50:32+00:00","cve":"CVE-2023-23934","urls":{"html":"https://cve.report/CVE-2023-23934","api":"https://cve.report/api/cve/CVE-2023-23934.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2023-23934","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-23934"},"summary":{"title":"CVE-2023-23934","description":"Werkzeug is a comprehensive WSGI web application library. Browsers may allow \"nameless\" cookies that look like `=value` instead of `key=value`. A vulnerable browser may allow a compromised application on an adjacent subdomain to exploit this to set a cookie like `=__Host-test=bad` for another subdomain. Werkzeug prior to 2.2.3 will parse the cookie `=__Host-test=bad` as __Host-test=bad`. If a Werkzeug application is running next to a vulnerable or malicious subdomain which sets such a cookie using a vulnerable browser, the Werkzeug application will see the bad cookie value but the valid cookie key. 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