CVEvulnerability

CVE-2023-23934

3.5 LOW Published 2023-02-14 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2023-02-14
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
2.6 LOW — CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
CVSS 3.1 ([email protected])
3.5 LOW — CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Weaknesses
CWE-20

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. The issue is fixed in Werkzeug 2.2.3.

Affected configurations

• palletsprojects werkzeug (< 2.2.3)

Related

Weakness · CWE (1)

  • CWE-20 Improper Input Validation weakness

References