CVE-2025-66803: Hotwired Turbo

Medium severity, CVSS 4.8. EPSS: 0.3% chance of exploitation in the next 30 days.

Race condition in the turbo-frame element handler in Hotwired Turbo before 8.0.x causes logout operations to fail when delayed frame responses reapply session cookies after logout. This can be exploited by remote attackers via selective network delays (e.g. delaying requests based on sequence or timing) or by physically proximate attackers when the race condition occurs naturally on shared computers.

Affected products

• Hotwired Turbo: before 8.0.21 (fixed in 8.0.21)

Published 2026-01-20. Last modified 2026-06-17.