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.
Published 2023-02-14 20:15:17
Updated 2023-08-18 14:15:21
Source GitHub, Inc.
View at NVD,   CVE.org
Vulnerability category: Input validation

Exploit prediction scoring system (EPSS) score for CVE-2023-23934

0.05%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 21 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2023-23934

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
3.5
LOW CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
2.1
1.4
NIST
2.6
LOW CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
1.2
1.4
GitHub, Inc.

CWE ids for CVE-2023-23934

  • The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
    Assigned by: security-advisories@github.com (Primary)

References for CVE-2023-23934

Products affected by CVE-2023-23934

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