CVE-2026-5396: Authorization Bypass in Fluent Forms
Plattform
wordpress
Komponente
fluentform
Behoben in
6.2.0
CVE-2026-5396 describes an authorization bypass vulnerability affecting the Fluent Forms WordPress plugin. This flaw allows authenticated attackers with limited manager access to manipulate submissions from forms they shouldn't have access to. Versions 0.0.0 through 6.1.21 are vulnerable, and a fix is available in version 6.2.0.
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Auswirkungen und Angriffsszenarien
The impact of this vulnerability is significant. An attacker, even with restricted manager privileges, can leverage the flawed form_id parameter to gain unauthorized access to sensitive form submission data. This includes reading confidential information entered by users, modifying submission statuses (e.g., marking a payment as complete when it isn't), adding misleading notes, and permanently deleting submissions. This could lead to data breaches, financial fraud, and reputational damage for organizations relying on Fluent Forms for critical processes like contact forms, surveys, and quizzes. The ability to delete submissions also poses a risk of data loss and denial of service.
Ausnutzungskontext
CVE-2026-5396 was published on 2026-05-14. Its CVSS score of 8.2 (HIGH) indicates a significant risk. Currently, there are no publicly known active campaigns exploiting this vulnerability, but the ease of exploitation (requiring only authenticated access) suggests it could become a target. Monitor security advisories and threat intelligence feeds for any indications of exploitation. No KEV or EPSS score is currently available.
Bedrohungsanalyse
Exploit-Status
CISA SSVC
CVSS-Vektor
Was bedeuten diese Metriken?
- Attack Vector
- Netzwerk — aus der Ferne über das Internet ausnutzbar. Kein physischer oder lokaler Zugriff erforderlich.
- Attack Complexity
- Niedrig — keine besonderen Bedingungen erforderlich. Zuverlässig ausnutzbar.
- Privileges Required
- Keine — ohne Authentifizierung ausnutzbar. Keine Zugangsdaten erforderlich.
- User Interaction
- Keine — automatischer und lautloser Angriff. Das Opfer tut nichts.
- Scope
- Unverändert — Auswirkung auf das anfällige Komponente beschränkt.
- Confidentiality
- Hoch — vollständiger Vertraulichkeitsverlust. Angreifer kann alle Daten lesen.
- Integrity
- Niedrig — Angreifer kann einige Daten mit begrenztem Umfang ändern.
- Availability
- Keine — kein Verfügbarkeitseinfluss.
Betroffene Software
Schwachstellen-Klassifikation (CWE)
Zeitleiste
- Reserviert
- Veröffentlicht
Mitigation und Workarounds
The primary mitigation is to upgrade Fluent Forms to version 6.2.0 or later, which addresses the authorization flaw. If immediate upgrading is not possible due to compatibility issues or testing requirements, consider restricting access to the formid parameter on the web server. Implement a Web Application Firewall (WAF) rule to block requests containing suspicious formid values. Carefully review user roles and permissions within Fluent Forms to ensure the principle of least privilege is enforced, limiting manager access to only the forms they absolutely need to manage. After upgrading, verify the fix by attempting to access submissions from a form the user should not have access to, ensuring the request is properly denied.
So beheben
Aktualisieren Sie auf Version 6.2.0 oder eine neuere gepatchte Version
Häufig gestellte Fragen
What is CVE-2026-5396 — Authorization Bypass in Fluent Forms?
CVE-2026-5396 is a high-severity vulnerability in the Fluent Forms WordPress plugin allowing authenticated attackers to manipulate form submissions by spoofing the form_id parameter.
Am I affected by CVE-2026-5396 in Fluent Forms?
You are affected if you are using Fluent Forms version 0.0.0 through 6.1.21. Check your plugin version and upgrade immediately if vulnerable.
How do I fix CVE-2026-5396 in Fluent Forms?
Upgrade Fluent Forms to version 6.2.0 or later to resolve the authorization bypass vulnerability. Consider temporary WAF rules if immediate upgrade is not possible.
Is CVE-2026-5396 being actively exploited?
Currently, there are no publicly known active campaigns exploiting CVE-2026-5396, but its ease of exploitation suggests it could become a target.
Where can I find the official Fluent Forms advisory for CVE-2026-5396?
Refer to the official Fluent Forms website and WordPress plugin repository for the latest security advisory and update information regarding CVE-2026-5396.
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