CVE-2023-39042Public exploitNetwork attack vector

Message forgery via exposed channel access token

Published Nov 2, 2023 · Updated Sep 5, 2024

Information disclosure in Gyouza-newhushimi 13.6.1 allows remote attackers to obtain its LINE channel access token. The public CVE record and surviving reference metadata do not disclose where the application exposes the token or which request returns it. No account or user interaction is required; the leaked bearer credential enables crafted LINE messages as the affected channel, with no reported data modification or service interruption.

CVSS severity7.5
High
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Gyouza-newhushimi 13.6.1 allows remote attackers to obtain its LINE channel access token. The public CVE record and surviving reference metadata do not disclose where the application exposes the token or which request returns it. No account or user interaction is required; the leaked bearer credential enables crafted LINE messages as the affected channel, with no reported data modification or service interruption.

The record

CVE
CVE-2023-39042
Published
Nov 2, 2023
Updated
Sep 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-200, T1528
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 2, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 5, 2024Record 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

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1528Steal Application Access Token

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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