CVE-2025-66803 Turbo Frame responses can restore stale session cookies
Remote attackers can bypass logout mechanisms by exploiting a race condition in Hotwired Turbo, allowing session cookies to be reapplied after logout.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-66803?
CVE-2025-66803 is a medium-severity vulnerability in n/a, published on 20 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-362
Which versions are affected by CVE-2025-66803?
2 open source packages ship an affected version, including @hotwired/turbo. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
@hotwired/turbo npm | All versions | 8.0.21 |
@hotwired/turbo npm | All versions | 8.0.21 |
Products include Hotwired Turbo.
How do I fix CVE-2025-66803?
Upgrade @hotwired/turbo to 8.0.21 or later.
Is CVE-2025-66803 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66803 exists.
Sources
Also known as GHSA-qppm-g56g-fpvp.