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Signals Exploited in the wild (KEV) 0 Patch available 1 No fix listed 0 Has CVE 1

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Impact type Code execution 1 Privilege escalation 0 Security bypass 1 Information disclosure 0 Tampering 0 Denial of service 0 Spoofing 0 Cross-site scripting 0 SQL injection 0

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Requirements No authentication 1 No user interaction 1

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Weakness (CWE) CWE-287 Improper Authentication 1 CWE-345 Insufficient Verification of Data Authenticity 1 CWE-502 Deserialization of Untrusted Data 1 CWE-565 Reliance on Cookies without Validation and Integrity Checking 1

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Vendor: rack × Component: Rack-session × Clear all filters

TI-2026-28312 CVE-2026-39324 · GHSA-33qg-7wpp-89cq

Rack::Session::Cookie secrets: decrypt failure fallback enables secretless session forgery and Marshal deserialization

Priority MEDIUM 48

Rack::Session is a session management implementation for Rack.

CVSS 4.0CRITICAL 9.3· Network · No auth · No interaction · EPSS 0.00274 · Published 2026-04-07 · Fixed in 2.1.2 CWE-287

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