Authentication bypass via unsigned JWT acceptance
Published Jun 9, 2026 · Updated Jun 9, 2026
Authentication bypass in BookCars 8.3 allows remote attackers to impersonate users by submitting a forged JWT to validateAccessToken. The function accepts token claims without cryptographically verifying the JWT signature, treating attacker-controlled identity data as authentic. No credentials or user interaction are required; the public record confirms authentication bypass but does not identify the reachable endpoint or the privileges of a selected account.
Summary
What happened
Authentication bypass in BookCars 8.3 allows remote attackers to impersonate users by submitting a forged JWT to validateAccessToken. The function accepts token claims without cryptographically verifying the JWT signature, treating attacker-controlled identity data as authentic. No credentials or user interaction are required; the public record confirms authentication bypass but does not identify the reachable endpoint or the privileges of a selected account.
The record
- CVE
- CVE-2026-36721
- Published
- Jun 9, 2026
- Updated
- Jun 9, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-347, CAPEC-475, T1078
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 9, 2026CVE publishedPublication date reported by the CVE source.
- Jun 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Referenced BookCars exploit artifactproof of concept · unverified
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Technologies
Your stack
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Your stack
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