CVE-2026-18431

🎯 CVE-2026-18431 🇪🇺 EUVD

💬 0 Diskussion 📄 .md Alle CVEs anzeigen ✕

CVE-2026-18431 | The Avada theme for WordPress is vulnerable to Arbitrary File Write in all versions up to, and including, 7.16 when the Fusion Builder plugin is installed and active in versions up to, and including, 3.16. This is due to a chain of authorization and input validation weaknesses across the two components that makes it possible for unauthenticated attackers to write attacker-controlled files to the server. This can be used to create and execute arbitrary PHP fil

The Avada theme for WordPress is vulnerable to Arbitrary File Write in all versions up to, and including, 7.16 when the Fusion Builder plugin is installed and active in versions up to, and including, 3.16. This is due to a chain of authorization and input validation weaknesses across the two components that makes it possible for unauthenticated attackers to write attacker-controlled files to the server. This can be used to create and execute arbitrary PHP files, resulting in remote code execution and complete site compromise. Successful exploitation requires both Avada and Fusion Builder to be installed and active, as well as certain administrator-authored content to be present.

Klassifikation & Betroffenheit:

CWE-862 ThemeFusion Avada | Website Builder For WordPress & WooCommerce 0 ≤7.16Avada (Fusion) Builder 0 ≤3.16

Missing Authorization 🎯 High

The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

🛡️ Empfohlene Mitigation: Divide the product into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully mapping roles with data and functionality. Use role-based access control (RBAC) [REF-229] to enforce the roles at the appropriate boundaries. Note that this approach may not protect against horizontal…

Vollständige Definition bei MITRE ➔

⚔️ Typische Angriffsmuster (CAPEC):

CAPEC-665 · Exploitation of Thunderbolt Protection F… (Very High)

🎯 ATT&CK-Techniken (Kill-Chain-Verhalten):

T1211 · Exploitation for Defensive Evasion T1542.002 · Pre-OS Boot: Component Firmware T1556 · Modify Authentication Process

🧩 Ähnliche Schwachstellen (Hersteller/Klasse/Score-Band):

CVE-2026-101000 10.0 CVE-2026-77244 10.0 CVE-2026-81648 10.0 CVE-2026-77770 10.0 CVE-2026-28573 10.0

🧪 Exploit-Evidenz:

🐙 HORKimhab/CVE-2026-18431

📚 Referenzen & Quellen:

🇪🇺 Original-Eintrag (ENISA EUVD) 🇺🇸 NVD-Eintrag

Ausnutzungs-Zeitleiste:

Reserviert 2026

Veröffentlicht 08/2026

Heute 22.10.

CVSS-Vektor-Analyse: 9.8

AV · Angriffsvektor Netzwerk

AC · Komplexität Gering

PR · Privilegien Keine

UI · Interaktion Keine

S · Scope Unverändert

C · Vertraulichkeit Hoch

I · Integrität Hoch

A · Verfügbarkeit Hoch

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CNA-Bewertung (Wordfence): 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Veröffentlicht:26.08.2026

Aktualisiert:27.08.2026 17:17

Assigner (CNA):Wordfence

EUVD-ID:EUVD-2026-66293

Quellen: 🇪🇺 EUVD-Datenbank (ENISA) + 🇺🇸 NVD-Anreicherung · 24-h-Cache

CWE-862 ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Sicherheits-Update des Herstellers zeitnah einspielen und Netzwerksegmentierung prüfen.

Tier	CVEs	Anteil
≥90 %	725	0,2 %
≥50 %	3.224	0,9 %
≥10 %	22.086	5,9 %
<10 %	346.854	93,0 %

Tier

CVEs

Anteil

≥90 %

725

0,2 %

≥50 %

3.224

0,9 %

≥10 %

22.086

5,9 %

<10 %

346.854

93,0 %

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