CVE-2026-123535
MEDIUM
NVD
CVSS Score
4.2
Severity
MEDIUM
Published
Nov 08, 2026
Vendor
unknown
Description
Tornado before 6.6 does not validate the max_age argument of RequestHandler.set_cookie (also called by set_signed_cookie, set_secure_cookie, and clear_cookie), allowing injection of additional Set-Cookie attributes. When an application passes attacker-influenced input as max_age, an attacker can embed attributes such as Domain, Path, or Secure to widen the cookie's scope to parent paths or other subdomains.