CVE-2023-39732Public exploitNetwork attack vector

Broadcast message injection via exposed client secret

Published Oct 24, 2023 · Updated Sep 11, 2024

Credential exposure in Tokueimaru Waiting LINE 13.6.1 allows remote attackers to obtain a channel token and send broadcasts. The public LIFF endpoint exposes its channel client secret, which the LINE token service accepts when issuing a channel access token. No authentication or user interaction is required, and the token permits crafted messages to be broadcast through the affected channel.

CVSS severity8.2
High
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Credential exposure in Tokueimaru Waiting LINE 13.6.1 allows remote attackers to obtain a channel token and send broadcasts. The public LIFF endpoint exposes its channel client secret, which the LINE token service accepts when issuing a channel access token. No authentication or user interaction is required, and the token permits crafted messages to be broadcast through the affected channel.

The record

CVE
CVE-2023-39732
Published
Oct 24, 2023
Updated
Sep 11, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-269, T1528
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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

8.2NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/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-269Improper Privilege Management
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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