CVE-2023-39851Public exploitNetwork attack vector

Database preference overwrite via session identifier concatenation

Published Aug 15, 2023 · Updated Jul 3, 2025

SQL injection in mainmenu.php in webchess 1.0 allows remote attackers to alter preference records through crafted session data. The main-menu code concatenates $_SESSION['playerID'] without quoting into UPDATE statements that write the preferences table. The record is disputed because playerID is server-controlled session state, leaving no established path for attackers to supply SQL.

CVSS severity9.8
Critical
EPSS probability0.85%
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 mainmenu.php in webchess 1.0 allows remote attackers to alter preference records through crafted session data. The main-menu code concatenates $_SESSION['playerID'] without quoting into UPDATE statements that write the preferences table. The record is disputed because playerID is server-controlled session state, leaving no established path for attackers to supply SQL.

The record

CVE
CVE-2023-39851
Published
Aug 15, 2023
Updated
Jul 3, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-89, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2023CVE publishedPublication date reported by the CVE source.
  2. Jul 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

Public exploit references

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Technologies

Your stack

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Your stack

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