CVE-2023-43993Public exploitNetwork attack vector

Malicious notifications via exposed channel access token

Published Jan 24, 2024 · Updated Sep 4, 2024

Information exposure in the smaregi_app_market MINI App in LINE 13.6.1 allows remote authenticated users to send malicious notifications. The MINI App exposes its channel access token, which LINE's notification flow accepts as bearer authorization when issuing a service notification token. A valid LINE session and access to the affected MINI App are required; the leaked token permits forged service messages, but no other impact is documented.

CVSS severity5.4
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information exposure in the smaregi_app_market MINI App in LINE 13.6.1 allows remote authenticated users to send malicious notifications. The MINI App exposes its channel access token, which LINE's notification flow accepts as bearer authorization when issuing a service notification token. A valid LINE session and access to the affected MINI App are required; the leaked token permits forged service messages, but no other impact is documented.

The record

CVE
CVE-2023-43993
Published
Jan 24, 2024
Updated
Sep 4, 2024
Vendor
LINE Corporation
Product
LINE
Classifications
CWE-200, T1528
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 24, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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 privilegesauthenticated

What is affected?

LINE Corporation · LINEversion=13.6.1

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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
Privilegesauthenticated
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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