CVE-2026-36721 Auth bypass in n/a
Attackers can bypass authentication and take over accounts by forging JWT tokens due to missing signature verification in Bookcars.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-36721?
CVE-2026-36721 is a critical authentication bypass vulnerability in n/a, published on 9 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A lack of cryptographic signature verification in the validateAccessToken function of bookcars v8.3 allows attackers to bypass authentication via a forged JWT token.
Weakness: CWE-347
Which versions are affected by CVE-2026-36721?
How do I fix CVE-2026-36721?
No fix has been published for CVE-2026-36721 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-36721 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-36721 exists.
Sources
Also known as GHSA-hjjc-9hhm-h336.