CVE-2025-66803
CVE-2025-66803 is a medium-severity vulnerability in Hotwired Turbo with a CVSS 3.x base score of 4.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-362.
Key facts
- Severity: Medium (CVSS 3.x base score 4.8)
- EPSS exploit prediction: 0% (15th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-3351
- Weakness: CWE-362
- Affected product: Hotwired Turbo
- Published:
- Last modified:
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2025-66803?
- CVE-2025-66803 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2025-66803 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-66803?
- CVE-2025-66803 affects Hotwired Turbo. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2025-66803?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2025-66803 have an EU (EUVD) identifier?
- Yes. CVE-2025-66803 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3351.
- When was CVE-2025-66803 published?
- CVE-2025-66803 was published on 2026-01-20 and last updated on 2026-06-17.
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
Affected products (1)
- cpe:2.3:a:hotwired:turbo:*:*:*:*:*:node.js:*:*
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