CVE Details

Release Date:2023-02-14


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. The issue is fixed in Werkzeug 2.2.3.

See more information about CVE-2023-23934 from MITRE CVE dictionary and NIST NVD

CVSS v3.0 metrics

NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.

Base Score: 3.5 Base Metrics: AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Access Vector: Adjacent network Attack Complexity: Low
Privileges Required: None User Interaction: Required
Scope: Unchanged Confidentiality Impact: None
Integrity Impact: Low Availability Impact: None

Errata information

PlatformErrataRelease Date
Oracle Linux version 8 (python-werkzeug)ELSA-2023-127092023-08-06

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