CVE-2021-31650Public exploitNetwork attack vector

Arbitrary SQL execution via crafted login username

Published Dec 16, 2022 · Updated Apr 21, 2025

SQL injection in Sourcecodester Online Grading System 1.0 allows remote attackers to execute arbitrary SQL commands via the uname parameter. The unauthenticated POST handler at /onlinegradingsystem/admin/login.php evaluates a crafted uname value as part of a database query, including injected time-delay expressions. Successful exploitation reaches the application's database with the query's privileges, enabling database reads, writes, or deletion without a valid account.

CVSS severity9.8
Critical
EPSS probability1.37%
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 Sourcecodester Online Grading System 1.0 allows remote attackers to execute arbitrary SQL commands via the uname parameter. The unauthenticated POST handler at /onlinegradingsystem/admin/login.php evaluates a crafted uname value as part of a database query, including injected time-delay expressions. Successful exploitation reaches the application's database with the query's privileges, enabling database reads, writes, or deletion without a valid account.

The record

CVE
CVE-2021-31650
Published
Dec 16, 2022
Updated
Apr 21, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-89, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 16, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 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

9.8NVDCVSS: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

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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