CVE-2023-43999Network attack vector

Malicious notification injection via exposed channel token

Published Jan 24, 2024 · Updated Jun 11, 2025

Credential exposure in the COLORFUL_laundry mini-app on LINE 13.6.1 allows remote authenticated users to send crafted notifications. The members_card response exposes a LINE channel access token without adequately protecting the credential from callers. Access to the affected mini-app is required; possession of the token permits notification injection, with no reported availability impact.

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

Credential exposure in the COLORFUL_laundry mini-app on LINE 13.6.1 allows remote authenticated users to send crafted notifications. The members_card response exposes a LINE channel access token without adequately protecting the credential from callers. Access to the affected mini-app is required; possession of the token permits notification injection, with no reported availability impact.

The record

CVE
CVE-2023-43999
Published
Jan 24, 2024
Updated
Jun 11, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1528
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 24, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 11, 2025Record 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1528Steal Application Access Token

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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