CVE-2023-39735Network attack vector

Broadcast-message forgery via exposed client secret

Published Oct 24, 2023 · Updated Sep 12, 2024

Client-secret exposure in LINE Corporation Uomasa Saiji News 13.6.1 allows remote attackers to send forged broadcast messages. The public record states that the application leaks its client secret but does not identify the file, endpoint, or operation that exposes it. Unauthenticated network access is sufficient to obtain a channel access token, enabling 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

Client-secret exposure in LINE Corporation Uomasa Saiji News 13.6.1 allows remote attackers to send forged broadcast messages. The public record states that the application leaks its client secret but does not identify the file, endpoint, or operation that exposes it. Unauthenticated network access is sufficient to obtain a channel access token, enabling messages to be broadcast through the affected channel.

The record

CVE
CVE-2023-39735
Published
Oct 24, 2023
Updated
Sep 12, 2024
Vendor
LINE Corporation
Product
Uomasa Saiji News
Classifications
CWE-200, T1552
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 12, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=13.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LINE Corporation · Uomasa Saiji Newsversion=13.6.1

Published CVSS scores

8.2CISA-ADPCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1552Unsecured Credentials

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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