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Online Reviewer System CVE-2021-27130

CRITICAL
SQL Injection (CWE-89)
2021-04-14 cve@mitre.org
Authentication Bypass SQLi Online Reviewer System Janobe
9.8
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-89
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Parameterized queries, prepared statements
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Persistence

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available. EPSS exploitation probability: 0.54%.
Exploit ScenarioDerived

A remote attacker could execute arbitrary SQL commands against the database by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.
Act Now Prioritize within 24-48h. Why: CRITICAL severity + public POC available.
No patch listed yet 0.5% exploitation probability (EPSS)

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AnalysisAI

Online Reviewer System 1.0 contains a SQL injection vulnerability through authentication bypass, which may lead to a reverse shell upload. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Use parameterized queries/prepared statements. Never concatenate user input into SQL. Apply least-privilege database permissions.

Affects your stack

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Technical ContextAI · show details

This vulnerability is classified as SQL Injection (CWE-89), which allows attackers to execute arbitrary SQL commands against the database. Online Reviewer System 1.0 contains a SQL injection vulnerability through authentication bypass, which may lead to a reverse shell upload. Affected products include: Janobe Online Reviewer System.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionCVE.org

Online Reviewer System 1.0 contains a SQL injection vulnerability through authentication bypass, which may lead to a reverse shell upload.

Threat Intelligence Overview

EPSS Score
0.5%
Top 32% exploitable
Exploit
POC
Public exploit code exists
Data Quality
4 sources
Confidence: Medium
NVD CVE.org EPSS VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity CRITICAL
CISA KEV No
Public POC Yes
EPSS 0.5%
Patch available No
Active threat No
Deciding rule
CRITICAL severity + public POC available
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
Poc
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

70
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +49
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

SQL Injection HIGH

SQL injection exploits the way applications construct database queries by mixing user input directly into SQL statements.

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)CVE.org

cpe:2.3:a:janobe:online_reviewer_system:1.0:*:*:*:*:*:*:*

More in Online Reviewer System

View all
CVE-2021-41646 CRITICAL POC
9.8 Oct 29

Remote Code Execution (RCE) vulnerability exists in Sourcecodester Online Reviewer System 1.0 by uploading a maliciously
CVE-2023-2596 MEDIUM POC
6.3 May 09

A vulnerability was found in SourceCodester Online Reviewer System 1.0 and classified as critical. Rated medium severity
CVE-2026-109620 MEDIUM POC
5.5 Oct 13

SQL injection in SourceCodester Online Reviewer System 1.0 allows unauthenticated remote attackers to alter the SQL quer
CVE-2026-2166 MEDIUM POC
5.5 Feb 08

SQL injection in the Online Reviewer System 1.0 login function allows unauthenticated remote attackers to manipulate use
CVE-2026-2195 MEDIUM POC
5.5 Feb 09

SQL injection in code-projects Online Reviewer System 1.0 via the ID parameter in the questions-view.php file allows una
CVE-2026-2912 MEDIUM POC
5.5 Feb 22

SQL injection in Online Reviewer System 1.0 allows unauthenticated remote attackers to manipulate the test_id parameter

CVE-2026-2221 MEDIUM POC
5.5 Feb 09

SQL injection in the login component of code-projects Online Reviewer System 1.0 allows unauthenticated remote attackers
CVE-2026-2220 MEDIUM POC
5.5 Feb 09

SQL injection in code-projects Online Reviewer System 1.0 via the difficulty_id parameter in /system/system/admins/asses
CVE-2026-2199 MEDIUM POC
5.5 Feb 09

SQL injection in code-projects Online Reviewer System 1.0 allows unauthenticated remote attackers to manipulate the ID p
CVE-2026-2198 MEDIUM POC
5.5 Feb 09

SQL injection in code-projects Online Reviewer System 1.0 via the difficulty_id parameter in /system/system/admins/asses
CVE-2026-2197 MEDIUM POC
5.5 Feb 09

SQL injection in code-projects Online Reviewer System 1.0 allows remote attackers to manipulate the test_id parameter in
CVE-2026-2196 MEDIUM POC
5.5 Feb 09

SQL injection in code-projects Online Reviewer System 1.0 allows unauthenticated remote attackers to manipulate the test

Same weakness CWE-89 – SQL Injection

View all
CVE-2023-48788 CRITICAL POC
9.8
CVE-2019-7481 HIGH POC
7.5
CVE-2025-57819 CRITICAL POC
10.0
CVE-2017-8917 CRITICAL POC
9.8
CVE-2024-27956 CRITICAL POC
9.9
CVE-2014-3704 HIGH POC
7.5
CVE-2016-2555 CRITICAL POC
9.8
CVE-2016-8582 CRITICAL POC
9.8

Same technique Authentication Bypass

View all
CVE-2015-3306 CRITICAL POC
10.0
CVE-2023-22515 CRITICAL POC
9.8
CVE-2012-4681 CRITICAL POC
9.8
CVE-2013-2465 CRITICAL POC
9.8
CVE-2011-3544 CRITICAL POC
9.8
CVE-2022-40684 CRITICAL POC
9.8
CVE-2025-61882 CRITICAL POC
9.8
CVE-2024-0012 CRITICAL POC
9.3

References

Advisories & patches
ADVISORY https://vuldb.com/vuln/173040

Search Externally

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