CVE-2026-6828: XSS in Fluent Forms Contact Forms
Plattform
wordpress
Komponente
fluentform
Behoben in
6.2.2
CVE-2026-6828 describes a Stored Cross-Site Scripting (XSS) vulnerability discovered in the Fluent Forms plugin for WordPress. This vulnerability allows authenticated attackers, specifically those with contributor-level access or higher, to inject arbitrary web scripts. Successful exploitation could lead to data theft, session hijacking, or defacement of the WordPress site. The vulnerability impacts versions 0.0.0 through 6.2.1, and a patch is available in version 6.2.2.
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Auswirkungen und Angriffsszenarien
An attacker exploiting this XSS vulnerability can inject malicious JavaScript code into the 'permission_message' field within Fluent Forms. Because this message is stored and displayed to other users, the injected script will execute whenever a user views the affected page. This could allow an attacker to steal sensitive user data, such as cookies and session tokens, leading to account takeover. Furthermore, the attacker could redirect users to malicious websites, deface the website, or even execute arbitrary code within the context of the user's browser. The blast radius extends to all users who view pages containing the injected script, making it a significant risk, especially for sites with high traffic or sensitive user data.
Ausnutzungskontext
As of the publication date (2026-05-13), there is no indication that CVE-2026-6828 is being actively exploited in the wild. No public Proof-of-Concept (POC) exploits have been released. The vulnerability is currently rated as Medium severity. It is not listed on CISA Known Exploited Vulnerabilities (KEV) catalog. Monitor security advisories and threat intelligence feeds for any updates regarding exploitation attempts.
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
- Niedrig — jedes gültige Benutzerkonto ist ausreichend.
- User Interaction
- Keine — automatischer und lautloser Angriff. Das Opfer tut nichts.
- Scope
- Geändert — Angriff kann über die anfällige Komponente hinaus auf andere Systeme übergreifen.
- Confidentiality
- Niedrig — partieller oder indirekter Zugriff auf einige Daten.
- Integrity
- Niedrig — Angreifer kann einige Daten mit begrenztem Umfang ändern.
- Availability
- Keine — kein Verfügbarkeitseinfluss.
Betroffene Software
Schwachstellen-Klassifikation (CWE)
Zeitleiste
- Reserviert
- Veröffentlicht
- Geändert
Mitigation und Workarounds
The primary mitigation for CVE-2026-6828 is to immediately upgrade the Fluent Forms plugin to version 6.2.2 or later. If upgrading is not immediately feasible due to compatibility issues or testing requirements, consider implementing a temporary workaround by sanitizing user input in the 'permissionmessage' field. This could involve using WordPress's built-in escaping functions (e.g., escattr(), eschtml()) to prevent the injection of malicious code. Web Application Firewalls (WAFs) configured to detect and block XSS payloads can also provide an additional layer of protection. After upgrading, verify the fix by creating a new form, injecting a simple JavaScript payload into the 'permissionmessage' field, and confirming that the script does not execute when the form is viewed.
So beheben
Aktualisieren Sie auf Version 6.2.2 oder eine neuere gepatchte Version
Häufig gestellte Fragen
What is CVE-2026-6828 — XSS in Fluent Forms Contact Forms?
CVE-2026-6828 is a Stored Cross-Site Scripting (XSS) vulnerability in the Fluent Forms plugin for WordPress. It allows authenticated attackers to inject malicious scripts via the 'permission_message' parameter, potentially leading to data theft and session hijacking.
Am I affected by CVE-2026-6828 in Fluent Forms Contact Forms?
You are affected if you are using Fluent Forms versions 0.0.0 through 6.2.1 and have users with contributor-level access or higher.
How do I fix CVE-2026-6828 in Fluent Forms Contact Forms?
Upgrade Fluent Forms to version 6.2.2 or later. As a temporary workaround, sanitize user input in the 'permission_message' field using WordPress escaping functions.
Is CVE-2026-6828 being actively exploited?
As of the publication date, there is no evidence of active exploitation, but it's crucial to apply the patch promptly to prevent potential future attacks.
Where can I find the official Fluent Forms advisory for CVE-2026-6828?
Refer to the official Fluent Forms website and WordPress plugin repository for the latest security advisory and update information regarding CVE-2026-6828.
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