How severe is CVE-2026-36727?

CVE-2026-36727 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-36727 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-36727?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-36727 have an EU (EUVD) identifier?

Yes. CVE-2026-36727 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35929.

When was CVE-2026-36727 published?

CVE-2026-36727 was published on 2026-06-09 and last updated on 2026-06-17.

CVE-2026-36727

CVE-2026-36727 is a critical-severity vulnerability with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-35929
Weakness: CWE-287
Published: 2026-06-09
Last modified: 2026-06-17

Description

An insecure authentication vulnerability in the /api/social-sign-in endpoint of bookcars v8.3 allows attackers to bypass authentication via a forged JWT token.

Frequently asked questions

What is CVE-2026-36727?: An insecure authentication vulnerability in the /api/social-sign-in endpoint of bookcars v8.3 allows attackers to bypass authentication via a forged JWT token.
How severe is CVE-2026-36727?: CVE-2026-36727 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-36727 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-36727?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-36727 have an EU (EUVD) identifier?: Yes. CVE-2026-36727 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35929.
When was CVE-2026-36727 published?: CVE-2026-36727 was published on 2026-06-09 and last updated on 2026-06-17.

References

https://github.com/CC-T-454455/Vulnerabilities/tree/master/bookcars/vulnerability-1

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