CVE-2018-6411

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 6%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

An issue was discovered in Appnitro MachForm before 4.2.3. When the form is set to filter a blacklist, it automatically adds dangerous extensions to the filters. If the filter is set to a whitelist, the dangerous extensions can be bypassed through ap_form_elements SQL Injection.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Track*)
EG Risk 75/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation65% × 40%
Automatability30% × 15%
Action: Watch closely — could escalate to Attend.
EPSS
92.4%
KEV
Not listed

Published

May 26, 2018

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated May 26, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

MachForm 4.2.3 Security Release | HTML Form Builder Online, PHP Form Creator - MachForm

https://www.machform.com/blog-machform-423-security-release/
generic🟡 PoC Available

MachForm < 4.2.3 - SQL Injection / Path Traversal / Upload Bypass - PHP webapps Exploit

https://www.exploit-db.com/exploits/44804/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 14:15 UTCEPSS rescore
  2. 2026-07-23 14:15 UTCEPSS rescore
  3. 2026-07-23 01:37 UTCEG score recompute
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  58. 2026-05-28 13:42 UTCEPSS rescore
  59. 2026-05-28 07:47 UTCEG score recompute
  60. 2026-05-28 07:47 UTCGHSA enrichment
  61. 2026-05-27 13:38 UTCEPSS rescore
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Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-44804✓ verified
    First seen May 30, 2018

    MachForm < 4.2.3 - SQL Injection / Path Traversal / Upload Bypass

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2018-6411?
CVE-2018-6411 is a critical vulnerability published on May 26, 2018. An issue was discovered in Appnitro MachForm before 4.2.3. When the form is set to filter a blacklist, it automatically adds dangerous extensions to the filters. If the filter is set to a whitelist, the dangerous extensions can be bypassed through apformelements SQL Injection.
When was CVE-2018-6411 disclosed?
CVE-2018-6411 was first published in the National Vulnerability Database on May 26, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-6411 actively exploited?
CVE-2018-6411 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 92.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-6411?
CVE-2018-6411 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2018-6411?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-6411, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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