VulnerabilityPublished 26 Jan 2024Updated 3 Jun 2025

CVE-2024-23388: "Mercari" App for Android · Improper authorization in handler for custom URL scheme

Affects "Mercari" App for AndroidSource CVE Database V5

Not known to be exploited · CVSS 6.1 Medium : upgrade to 5.78.0 when convenient.

Data as of 26 Oct 2026, 09:15 UTC

CVSS 3.1 base score

6.1Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 32% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 5.78.0

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Changed
Confidentiality: Low
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 26 Jan 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade the Alpine alpine/mercari package to 5.78.0.

Affected software

Product	Affected	Fixed in
Alpinealpine/mercari`pkg:apk/alpine/mercari`Other threats	Affected <5.78.0	Fixed in 5.78.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

To mitigate this vulnerability effectively, European organizations should: 1) Enforce a policy requiring all users to update the Mercari Android app to version 5.78.0 or later immediately, ensuring the patched version is installed. 2) Implement mobile device management (MDM) solutions to monitor and control app versions on corporate and BYOD devices, preventing use of vulnerable app versions. 3) Educate users about the risks of clicking on unsolicited or suspicious links, especially those that may appear to originate from trusted apps like Mercari. 4) Employ advanced email and web filtering solutions to detect and block phishing URLs that exploit this vulnerability. 5) Encourage the use of multi-factor authentication (MFA) on all critical accounts to reduce the impact of credential compromise resulting from phishing. 6) Monitor network traffic for unusual redirection patterns or access to known malicious domains that could indicate exploitation attempts. 7) Coordinate with security teams to update threat intelligence feeds with indicators related to this vulnerability once available.

Description

Improper authorization in handler for custom URL scheme issue in "Mercari" App for Android prior to version 5.78.0 allows a remote attacker to lead a user to access an arbitrary website via the vulnerable App. As a result, the user may become a victim of a phishing attack.

Impact

For European organizations, the primary impact of this vulnerability lies in the increased risk of phishing attacks targeting employees using the Mercari Android app. Since the vulnerability enables redirection to arbitrary websites, attackers can craft convincing phishing campaigns that exploit user trust in the Mercari app to harvest credentials or deliver malware. This can lead to compromised user accounts, unauthorized access to corporate resources if credentials are reused, and potential lateral movement within organizational networks. Additionally, organizations with employees who use the Mercari app for business or personal purposes on corporate devices may face increased risk of data leakage or compromise. The vulnerability does not directly impact the confidentiality, integrity, or availability of organizational systems but acts as an attack vector facilitating social engineering attacks. Given the app’s user base and the medium severity, the threat is more significant in sectors with high reliance on mobile commerce or where employees frequently use personal devices for work (BYOD environments).

CWE-862Missing Authorization (opens in a new tab)
Class weaknessLikelihood of exploit: HighCWE Top 25 (2025): #4OWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The product does not perform an authorization check when an actor attempts to access a resource or perform an action.
Architecture and Design
Divide the product into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully mapping roles with data and functionality. Use role-based access control (RBAC) to enforce the roles at the appropriate boundaries.
Architecture and Design
Ensure that access control checks are performed related to the business logic. These checks may be different than the access control checks that are applied to more generic resources such as files, connections, processes, memory, and database records.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
OWASP Cheat Sheets
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V8.3.8 (opens in a new tab)
V13.4.2 (opens in a new tab)
V7.2.2 (opens in a new tab)
Attack patterns
Exploitation of Thunderbolt Protection Flaws (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

jvn.jp/en/jp/JVN70818619/ (opens in a new tab)

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 4 Jul 2025, 11:26 UTC

WeaknessesCWE-862

Technical details

References

Community reviews

Related threats