CVE-2025-66803

Name: CVE-2025-66803
Creator: NVD / NIST
Published: 2026-01-20T19:15:49.537+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.8/10EPSS 0.24%

Last modified Jun 17, 2026

CVE-2025-66803 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. 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. EPSS estimates a 0.24% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.8/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS Probability

0.24%

15.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-362

Affected Software

Vendor	Product	Versions
Hotwired	Turbo	< 8.0.21

References

https://github.com/hotwired/turbo/pull/1399Exploit, Issue Tracking, Patch
https://github.com/hotwired/turbo/security/advisories/GHSA-qppm-g56g-fpvpVendor Advisory
https://turbo.hotwired.dev/handbook/framesProduct

Timeline

Published: Jan 20, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-66803?

How severe is CVE-2025-66803?

CVE-2025-66803 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.24% probability of exploitation in the next 30 days.

How do I fix CVE-2025-66803?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-66803?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST