CVE-2023-40530

Malicious-site display via unrestricted custom URL scheme

Published Aug 25, 2023 · Updated Oct 2, 2024

Improper authorization in Skylark App 6.2.13 and earlier allows attackers to display arbitrary sites through a custom URL scheme. The scheme handler accepts a requested URL from another installed application without restricting which site the embedded WebView may open. A user must interact and have the initiating application installed; the bounded consequence is redirection to a malicious site within the app.

CVSS severity4.7
Medium
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

Improper authorization in Skylark App 6.2.13 and earlier allows attackers to display arbitrary sites through a custom URL scheme. The scheme handler accepts a requested URL from another installed application without restricting which site the embedded WebView may open. A user must interact and have the initiating application installed; the bounded consequence is redirection to a malicious site within the app.

The record

CVE
CVE-2023-40530
Published
Aug 25, 2023
Updated
Oct 2, 2024
Vendor
SKYLARK HOLDINGS CO., LTD.
Product
Skylark App
Classifications
CWE-862, CWE-939
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 2, 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=6.2.13 and earlier

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

SKYLARK HOLDINGS CO., LTD. · Skylark Appversion=6.2.13 and earlier

Published CVSS scores

4.3JPCERT/CCAV:N/AC:M/Au:N/C:N/I:P/A:N
3.6JPCERT/CCCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
4.7NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

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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