How severe is CVE-2023-39736?

CVE-2023-39736 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2023-39736 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-39736?

CVE-2023-39736 affects Linecorp Fukunaga Memberscard. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-39736?

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

When was CVE-2023-39736 published?

CVE-2023-39736 was published on 2023-10-25 and last updated on 2026-06-17.

CVE-2023-39736

CVE-2023-39736 is a high-severity vulnerability in Linecorp Fukunaga Memberscard with a CVSS 3.x base score of 8.2. 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-200.

Key facts

Severity: High (CVSS 3.x base score 8.2)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Linecorp Fukunaga Memberscard
Published: 2023-10-25
Last modified: 2026-06-17

Description

The leakage of the client secret in Fukunaga_memberscard Line 13.6.1 allows attackers to obtain the channel access token and send crafted broadcast messages.

Frequently asked questions

What is CVE-2023-39736?: The leakage of the client secret in Fukunaga_memberscard Line 13.6.1 allows attackers to obtain the channel access token and send crafted broadcast messages.
How severe is CVE-2023-39736?: CVE-2023-39736 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2023-39736 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-39736?: CVE-2023-39736 affects Linecorp Fukunaga Memberscard. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-39736?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-39736 published?: CVE-2023-39736 was published on 2023-10-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:linecorp:fukunaga_memberscard:13.6.1:*:*:*:*:*:*:*

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