How severe is CVE-2023-39731?

CVE-2023-39731 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2023-39731 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.

What products are affected by CVE-2023-39731?

CVE-2023-39731 affects Line Kaibutsunosato. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-39731?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-39731 published?

CVE-2023-39731 was published on 2023-10-20 and last updated on 2026-06-17.

CVE-2023-39731

CVE-2023-39731 is a medium-severity vulnerability in Line Kaibutsunosato with a CVSS 3.x base score of 5.3. 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-284.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-284
Affected product: Line Kaibutsunosato
Published: 2023-10-20
Last modified: 2026-06-17

Description

The leakage of the client secret in Kaibutsunosato v13.6.1 allows attackers to obtain the channel access token and send crafted broadcast messages.

Frequently asked questions

What is CVE-2023-39731?: The leakage of the client secret in Kaibutsunosato v13.6.1 allows attackers to obtain the channel access token and send crafted broadcast messages.
How severe is CVE-2023-39731?: CVE-2023-39731 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2023-39731 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.
What products are affected by CVE-2023-39731?: CVE-2023-39731 affects Line Kaibutsunosato. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-39731?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-39731 published?: CVE-2023-39731 was published on 2023-10-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:line:kaibutsunosato:13.6.1:*:*:*:*:*:*:*

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