CVE-2023-3687Network attack vector

Authenticated SQL injection via blog s parameter

Published Jul 16, 2023 · Updated Aug 2, 2024

SQL injection in Bylancer QuickVCard 2.1 allows remote authenticated users to alter SQL queries through the s parameter on /blog. The GET parameter handler incorporates the attacker-controlled s value into an SQL command without proper neutralization; the exact function is undisclosed. A low-privileged account is required, and public records do not identify the readable or writable data or the attainable service interruption.

CVSS severity9.8
Critical
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in Bylancer QuickVCard 2.1 allows remote authenticated users to alter SQL queries through the s parameter on /blog. The GET parameter handler incorporates the attacker-controlled s value into an SQL command without proper neutralization; the exact function is undisclosed. A low-privileged account is required, and public records do not identify the readable or writable data or the attainable service interruption.

The record

CVE
CVE-2023-3687
Published
Jul 16, 2023
Updated
Aug 2, 2024
Vendor
Bylancer
Product
QuickVCard
Classifications
CWE-89, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 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=2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Bylancer · QuickVCardversion=2.1

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1190Exploit Public-Facing Application

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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