Turbo Frame responses can restore stale session cookies
Summary
A race condition in Turbo Frames allows delayed HTTP responses to restore stale session cookies after session-modifying operations.
Details
Browsers automatically process Set-Cookie headers from HTTP responses. When a Turbo Frame request is in-flight during a session-modifying action (such as logout), the delayed response may include a Set-Cookie header reflecting the session state at request time. This can result in stale session cookies being restored after the session was intentionally modified or invalidated.
This condition can occur naturally on slow networks. An active network attacker capable of delaying responses could potentially exploit this to restore previous session state.
Impact
Applications using Turbo Frames with cookie-based session storage may experience:
- Session state reversion after logout
- Unintended restoration of previous authentication state
The impact is limited to applications using client-side cookie storage for sessions. Applications using server-side session stores (Redis, database, etc.) are not meaningfully affected, as the server-side session state remains authoritative.
Patches
Upgrade to Turbo 8.0.21 or later. The fix cancels in-flight Turbo Frame requests when:
- The frame element is disconnected from the DOM
- The frame's disabled attribute is set
- The frame's src attribute is cleared
Workarounds
- Use server-side session storage instead of a cookie store like Rails's cookie store
- Ensure logout flows remove or disable Turbo Frame elements before invalidating sessions
References
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @hotwired/turbo | < 8.0.21 | 8.0.21 |
References
- https://github.com/hotwired/turbo/security/advisories/GHSA-qppm-g56g-fpvp
- https://nvd.nist.gov/vuln/detail/CVE-2025-66803
- https://github.com/hotwired/turbo/pull/1399
- https://github.com/hotwired/turbo/commit/899df356e9f4b3303cca217cd14b3f846edda10d
- https://github.com/hotwired/turbo
- https://github.com/hotwired/turbo/releases/tag/v8.0.21
- https://turbo.hotwired.dev/handbook/frames
- CVSS vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U- Weakness (CWE)
CWE-362, CWE-367, CWE-613- Platform
- npm
- Package
@hotwired/turbo- Disclosed
- 20.01.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-qppm-g56g-fpvp - CC BY 4.0
Vulnerability history: @hotwired/turbo
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
Know which vulnerabilities affect your application
With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.