CVE-2021-35437Public exploitNetwork attack vector

Unauthenticated code execution via blacklist-bypass SQL injection

Published Nov 16, 2023 · Updated Aug 29, 2024

SQL injection in LMXCMS 1.4 allows remote attackers to execute arbitrary code through the TagsAction name parameter. TagsAction removes HTML tags or URL-decodes input after the filter_sql blacklist runs, reconstructing blocked SQL keywords. No authentication or user interaction is required; a crafted GET request can alter the generated SQL and reach the reported code-execution impact.

CVSS severity9.8
Critical
EPSS probability0.98%
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 LMXCMS 1.4 allows remote attackers to execute arbitrary code through the TagsAction name parameter. TagsAction removes HTML tags or URL-decodes input after the filter_sql blacklist runs, reconstructing blocked SQL keywords. No authentication or user interaction is required; a crafted GET request can alter the generated SQL and reach the reported code-execution impact.

The record

CVE
CVE-2021-35437
Published
Nov 16, 2023
Updated
Aug 29, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-89, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 29, 2024Record 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

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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