Vulnerability in Hotwired Turbo
CVE-2025-66803
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.
Vulnerability class: Race Condition
EPSS: 0.002 (15.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.
Affected products
- Hotwired Turbo
- N/a — versions n/a
Weakness classification (CWE)
References
- cve@mitre.org (Exploit, Patch, Issue Tracking)
- cve@mitre.org (Product)
- cve@mitre.org (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-66803?
- CVE-2025-66803 is a medium-severity vulnerability in Hotwired Turbo, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 4.8/10. Published 2026-01-20.
- How severe is CVE-2025-66803?
- Medium severity. CVSS v3 base score is 4.8 out of 10.