CVE-2026-36727Public exploitNetwork attack vector

Account takeover via unsigned social-login JWTs

Published Jun 9, 2026 · Updated Jun 9, 2026

Improper authentication in BookCars 8.3 and earlier allows remote attackers to take over user accounts via forged social-login JWTs. The backend validateAccessToken function decodes token payloads with parseJwt but never verifies their cryptographic signatures; Facebook accepts any parseable token, while Apple only compares the decoded email. Network access to /api/social-sign-in is sufficient, with no credentials or user interaction, and successful exploitation impersonates the selected account.

CVSS severity9.1
Critical
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in BookCars 8.3 and earlier allows remote attackers to take over user accounts via forged social-login JWTs. The backend validateAccessToken function decodes token payloads with parseJwt but never verifies their cryptographic signatures; Facebook accepts any parseable token, while Apple only compares the decoded email. Network access to /api/social-sign-in is sufficient, with no credentials or user interaction, and successful exploitation impersonates the selected account.

The record

CVE
CVE-2026-36727
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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