CVE-2021-47966Public exploitNetwork attack vector

Database disclosure via blind SQL injection

Published May 15, 2026 · Updated May 15, 2026

Blind SQL injection in PHP Timeclock 1.04 allows remote attackers to extract database contents through the login_userid POST parameter. The login.php handler evaluates crafted login_userid input as part of a MySQL query, exposing time-based SLEEP and boolean RLIKE response oracles. No credentials or user interaction are required, and repeated POST requests can disclose employee names, credentials, and other database content.

CVSS severity8.8
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Blind SQL injection in PHP Timeclock 1.04 allows remote attackers to extract database contents through the login_userid POST parameter. The login.php handler evaluates crafted login_userid input as part of a MySQL query, exposing time-based SLEEP and boolean RLIKE response oracles. No credentials or user interaction are required, and repeated POST requests can disclose employee names, credentials, and other database content.

The record

CVE
CVE-2021-47966
Published
May 15, 2026
Updated
May 15, 2026
Vendor
PHP Timeclock Project
Product
PHP Timeclock
Classifications
CWE-89, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 15, 2026CVE publishedPublication date reported by the CVE source.
  2. May 15, 2026Record 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=1.04

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PHP Timeclock Project · PHP Timeclockversion=1.04

Published CVSS scores

8.2VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
8.8VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA: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)
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

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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