What’s Vulnerable › Vulnerabilities

CVE-2025-66803

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-01-20 · updated 2026-06-17
• Weakness: CWE-362

Description

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

How to fix

Upgrade to a fixed version: Hotwired Turbo 8.0.21. Check the vendor advisory for mitigations.

References

• https://github.com/hotwired/turbo/pull/1399
• https://github.com/hotwired/turbo/security/advisories/GHSA-qppm-g56g-fpvp
• https://turbo.hotwired.dev/handbook/frames

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