SEPTEMBER 17, 2026
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Case File

CVE-2026-91991

MEDIUM · CVSS 5.4 EPSS 0.22% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-15 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

Tornado versions prior to 6.5.8 are vulnerable to cookie attribute injection due to an incomplete fix, allowing attackers to manipulate cookie security attributes by using capitalized or legacy keyword arguments in the set_cookie function. This vulnerability can lead to unauthorized access or session hijacking by embedding malicious data in cookie parameters. Organizations using affected versions of Tornado should prioritize patching to mitigate potential security risks.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-91991
Severity
MEDIUM
CVSS
5.4
EPSS
0.22%

Original NVD Description

Tornado before 6.5.8 contains an incomplete fix for cookie attribute injection that allows attackers to inject arbitrary cookie attributes by passing capitalized or legacy keyword arguments to set_cookie. Attackers can embed semicolon-delimited data in capitalized parameters like Domain, Path, or SameSite to bypass validation and modify cookie security attributes.