CVE-2026-123535
Tornado before 6.6 Cookie Attribute Injection via set_cookie max_age
CVSS Score
4.2
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-74 |
| Vendor | tornadoweb |
| Product | tornado |
| Published | Nov 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
tornadoweb / tornado
0 < 6.6
References
Credits
🔍 zhangyan8216