CVE-2024-23388Network attack vector

Phishing via unrestricted custom URL scheme

Published Jan 26, 2024 · Updated Jun 3, 2025

Improper authorization in Mercari: Buy and Sell App before 5.78.0 allows remote attackers to redirect users to phishing sites. Its custom URL scheme accepts requests from arbitrary applications and opens the supplied URL without restricting access to that handler. Exploitation requires user interaction with an attacker-controlled request; the bounded consequence is navigation through the app to an arbitrary website.

CVSS severity6.1
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

Improper authorization in Mercari: Buy and Sell App before 5.78.0 allows remote attackers to redirect users to phishing sites. Its custom URL scheme accepts requests from arbitrary applications and opens the supplied URL without restricting access to that handler. Exploitation requires user interaction with an attacker-controlled request; the bounded consequence is navigation through the app to an arbitrary website.

The record

CVE
CVE-2024-23388
Published
Jan 26, 2024
Updated
Jun 3, 2025
Vendor
Mercari, Inc.
Product
Mercari: Buy and Sell App
Classifications
CWE-939, CWE-862, T1660
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 3, 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?

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

  1. Affected versionversion=prior to version 5.78.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mercari, Inc. · Mercari: Buy and Sell Appversion=prior to version 5.78.0

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.3JPCERT/CC and IPACVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3JPCERT/CC and IPAAV:N/AC:M/Au:N/C:N/I:P/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-939Improper Authorization in Handler for Custom URL Scheme
CWE-862Missing Authorization
T1660Phishing

Public exploit references

No public exploit references are available in this record.

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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