PoC Index

CVE-2023-23934

LOW 3.5EPSS 0.5%

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 v3.1
3.5 LOWCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
CVSS v3.1
2.6 LOWCVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
CVSS v3.1
2.6 LOWCVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
EPSS
0.51% chance of exploitation in the next 30 days, 41th percentile
Published
2023-02-14
Updated
2025-03-10

Proof-of-concept exploits (1)

References

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