What is CVE-2026-36721?

CVE-2026-36721 is a critical-severity vulnerability, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.8/10. Published 2026-06-09.

How severe is CVE-2026-36721?

Critical severity. CVSS v3 base score is 9.8 out of 10.

CVE-2026-36721

CVE-2026-36721

A lack of cryptographic signature verification in the validateAccessToken function of bookcars v8.3 allows attackers to bypass authentication via a forged JWT token.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

cve@mitre.org

Frequently asked questions

What is CVE-2026-36721?: CVE-2026-36721 is a critical-severity vulnerability, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.8/10. Published 2026-06-09.
How severe is CVE-2026-36721?: Critical severity. CVSS v3 base score is 9.8 out of 10.