Is CVE-2023-23934 actively exploited?

CVE-2023-23934 has no public evidence of in-the-wild exploitation as of 2024-11-21.

What is the CVSS score for CVE-2023-23934?

CVE-2023-23934 has a CVSS score of 2.6 (LOW severity). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N.

How do I patch CVE-2023-23934?

Patch guidance is available from palletsprojects security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2023-23934.

Which products are affected by CVE-2023-23934?

1 product: palletsprojects werkzeug.

CVE-2023-23934 - remediation guidance & executive summary

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.

CVSS Metrics

Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
Attack Vector: adjacent network
Complexity: high
Privileges: none
User Action: required
Scope: unchanged
Confidentiality: none
Integrity: low
Availability: none
Weaknesses: CWE-20 · Improper Input ValidationNVD-CWE-noinfo

Metadata

Primary Vendor: PALLETSPROJECTS
Published: 2/14/2023
Last Modified: 11/21/2024
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

palletsprojects : werkzeug

Remediation Guidance

Executive Summary

Cite this page

CVE-2023-23934. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2023-23934

View on NIST NVD

CVE-2023-23934 vulnerability