The MetForm – Contact Form, Survey, Quiz, & Custom Form Builder for Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'mf_form_id' Widget Setting in all versions up to, and including, 4.1.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The payload bypasses Elementor's save-time wp_kses_post filter because it contains no HTML tags, and MetForm's own str_replace transformation of script tags into JavaScript template literal expressions provides an additional delivery path.
CVE-2026-18100
MEDIUMPre-NVD 6.46.4—Trending — 4 sources updated this week
EchelonGraph scoreHIGH confidence
Score 6.4 from GitHub Security Advisory published 2026-08-25. a secondary CVSS source baseline 6.4; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
6.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.4Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.4
- EG Score
- 6.4(high)
- EG Risk
- 29(Track)EG Risk 29/100SSVC: 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 computedSeverity64% × 45%Exploitation0% × 40%Automatability0% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 12%
- KEV
- Not listed
Published
August 25, 2026
Last Modified
August 26, 2026
References (8)
- security@wordfencehttps://plugins.trac.wordpress.org/browser/metform/tags/4.1.4/controls/form-picker-utils.php#L45
- security@wordfencehttps://plugins.trac.wordpress.org/browser/metform/tags/4.1.4/utils/util.php#L605
- security@wordfencehttps://plugins.trac.wordpress.org/browser/metform/tags/4.1.4/widgets/form.php#L143
- security@wordfencehttps://plugins.trac.wordpress.org/browser/metform/tags/4.1.8/controls/form-picker-utils.php#L45
- security@wordfencehttps://plugins.trac.wordpress.org/browser/metform/tags/4.1.8/utils/util.php#L605
- security@wordfencehttps://plugins.trac.wordpress.org/browser/metform/tags/4.1.8/widgets/form.php#L143
- security@wordfencehttps://plugins.trac.wordpress.org/changeset?reponame=&new=3639278%40metform%2Ftrunk&old=3618333%40metform%2Ftrunk
- security@wordfencehttps://www.wordfence.com/threat-intel/vulnerabilities/id/976f1f01-ad5d-413e-a208-ae4b71a61502?source=cve
Vendor Advisories for CVE-2026-18100(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 17× in last 7d / 17× 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.
- 2026-08-30 01:22 UTCEPSS rescore
- 2026-08-29 11:00 UTCEG score recompute
- 2026-08-29 10:59 UTCGHSA enrichment
- 2026-08-28 21:41 UTCEPSS rescore
- 2026-08-28 12:50 UTCGHSA enrichment
- 2026-08-27 14:36 UTCEG score recompute
- 2026-08-27 14:35 UTCGHSA enrichment
- 2026-08-27 14:25 UTCEPSS rescore
- 2026-08-26 16:27 UTCEG score recompute
- 2026-08-26 16:27 UTCGHSA enrichment
- 2026-08-26 14:46 UTCEPSS rescore
- 2026-08-25 18:20 UTCEG score recompute
- 2026-08-25 18:19 UTCGHSA enrichment
- 2026-08-25 13:48 UTCEPSS rescore
- 2026-08-25 08:23 UTCEG score recompute
- 2026-08-25 07:58 UTCEG score recompute
- 2026-08-25 07:56 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-18100?
CVE-2026-18100 is a medium vulnerability published on August 25, 2026. The MetForm – Contact Form, Survey, Quiz, & Custom Form Builder for Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'mfformid' Widget Setting in all versions up to, and including, 4.1.8 due to insufficient input sanitization and output escaping. This makes it…
When was CVE-2026-18100 disclosed?
CVE-2026-18100 was first published in the National Vulnerability Database on August 25, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18100 actively exploited?
CVE-2026-18100 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 87.5% of all scored CVEs.
What is the CVSS score of CVE-2026-18100?
CVE-2026-18100 has a CVSS v3 base score of 6.4 (NVD).
How do I remediate CVE-2026-18100?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18100, 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.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-18100
Is Your Infrastructure Affected by CVE-2026-18100?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.