CVE-2026-6828: XSS in Fluent Forms Contact Forms
Platform
wordpress
Component
fluentform
Fixed in
6.2.2
CVE-2026-6828 describes a Stored Cross-Site Scripting (XSS) vulnerability discovered in the Fluent Forms plugin for WordPress. This flaw allows authenticated attackers, possessing contributor-level access or higher, to inject arbitrary web scripts. 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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Impact and Attack Scenarios
Successful exploitation of CVE-2026-6828 allows an attacker to execute malicious JavaScript code within the context of a user's browser when they access a page containing the injected script. This can lead to various consequences, including session hijacking, redirection to phishing sites, defacement of the WordPress site, and theft of sensitive user data. The attacker's ability to inject scripts hinges on having contributor-level access or higher, highlighting the importance of robust user permission management within WordPress installations. The impact is amplified if the injected script targets administrators or users with elevated privileges.
Exploitation Context
CVE-2026-6828 was published on 2026-05-13. Its severity is rated as Medium (CVSS 6.4). No public exploits or active campaigns targeting this vulnerability have been reported at the time of writing. It is not currently listed on KEV or EPSS, suggesting a low probability of immediate exploitation. Monitor security advisories and threat intelligence feeds for any updates.
Threat Intelligence
Exploit Status
CISA SSVC
CVSS Vector
What do these metrics mean?
- Attack Vector
- Network — remotely exploitable over the internet. No physical or local access required. Widest attack surface.
- Attack Complexity
- Low — no special conditions required. Attacker can exploit reliably without depending on rare configurations or timing.
- Privileges Required
- Low — any valid user account is sufficient. Basic authenticated access required.
- User Interaction
- None — attack is automatic and silent. Victim does nothing: no click, no file open.
- Scope
- Changed — successful attack can pivot beyond the vulnerable component to other systems or the host OS.
- Confidentiality
- Low — partial or indirect data access. Attacker gains limited information.
- Integrity
- Low — attacker can modify some data with limited scope or impact.
- Availability
- None — no availability impact. Service remains fully operational.
Affected Software
Weakness Classification (CWE)
Timeline
- Reserved
- Published
- Modified
Mitigation and 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 feasible due to compatibility issues or breaking changes, consider implementing a temporary workaround by sanitizing user input within the 'permission_message' field. This could involve stripping out potentially malicious HTML tags or encoding special characters. Web Application Firewalls (WAFs) configured to detect and block XSS payloads can also provide an additional layer of protection. Regularly review user permissions and ensure that only authorized personnel have access to sensitive areas of the WordPress site.
How to fix
Update to version 6.2.2, or a newer patched version
Frequently asked questions
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, allowing authenticated attackers to inject malicious scripts.
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.
Is CVE-2026-6828 being actively exploited?
No public exploits or active campaigns targeting this vulnerability have been reported at this time.
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 advisories and updates.
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