Cyber Resilience

CVE-2021-47872

HighPublic PoC

Published: 21 January 2026

Published
21 January 2026
Modified
15 April 2026
KEV Added
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Patch
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CVSS Score v4 7.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0004 14.2th percentile
Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-47872 is a high-severity SQL Injection (CWE-89) vulnerability. Its CVSS base score is 7.0 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 14.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Deeper analysis

CVE-2021-47872 is a blind SQL injection vulnerability (CWE-89) in SEO Panel versions prior to 4.9.0. The issue affects the archive.php page, where the 'order_col' parameter fails to properly sanitize user input, allowing attackers to inject malicious SQL code and manipulate database queries.

Authenticated attackers with low privileges (PR:L) can exploit this vulnerability over the network (AV:N) with low attack complexity (AC:L) and no user interaction (UI:N). Exploitation, such as via sqlmap, enables extraction of database information, resulting in high confidentiality impact (C:H), low integrity impact (I:L), and no availability impact (A:N), with an overall CVSS v3.1 score of 7.1.

Advisories recommend upgrading to SEO Panel version 4.9.0 to mitigate the vulnerability, as detailed in the project's GitHub release notes and issue tracker. Further technical details, including a public exploit, are available on Exploit-DB and Vulncheck.

EU & UK References

Vulnerability details

SEO Panel versions prior to 4.9.0 contain a blind SQL injection vulnerability in the archive.php page that allows authenticated attackers to manipulate database queries through the 'order_col' parameter. Attackers can use sqlmap to exploit the vulnerability and extract database information…

more

by injecting malicious SQL code into the order column parameter.

CWE(s)
CWE-89

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Why these techniques?

Blind SQL injection in a web application directly enables remote exploitation for database data extraction, mapping to T1190.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

CVEs Like This One

CVE-2026-39334Shared CWE-89
CVE-2024-13488Shared CWE-89
CVE-2026-20002Shared CWE-89
CVE-2025-1446Shared CWE-89
CVE-2025-22699Shared CWE-89
CVE-2026-36232Shared CWE-89
CVE-2026-31871Shared CWE-89
CVE-2026-33078Shared CWE-89
CVE-2026-46359Shared CWE-89
CVE-2025-22691Shared CWE-89

Affected Assets

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SEO Panel
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Directly requires validation of the 'order_col' input on archive.php to reject malicious SQL syntax before query execution.

SI-2 Flaw Remediation good match
prevent

Mandates timely application of the vendor patch (v4.9.0) that eliminates the unsanitized parameter flaw.

AC-6 Least Privilege partial match
prevent

Limits the database privileges granted to authenticated low-privilege accounts, reducing the impact of any successful blind SQLi extraction.

References