CVE-2026-11434
Cross-Site Scripting in FluentCMS Blocks Plugin
Publication date: 2026-06-06
Last updated on: 2026-06-06
Assigner: VulDB
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| fluentcms | fluentcms | 0.0.5 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-94 | The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. |
| CWE-79 | The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a Stored Cross-Site Scripting (XSS) flaw in the Blocks Plugin of FluentCMS version 0.0.5. It occurs due to insufficient input validation and sanitization in the plugin, allowing an attacker with admin privileges to inject malicious scripts into the 'Content' field of a block. These malicious scripts are stored on the server and automatically executed when other users access the affected page.
How can this vulnerability impact me? :
The vulnerability can lead to several serious impacts including session hijacking, malware distribution, credential theft, exposure of sensitive data, website defacement, user misdirection, and reputational damage. Since the malicious script executes when users view the affected page, attackers can compromise user data and systems remotely.
How can this vulnerability be detected on my network or system? Can you suggest some commands?
This vulnerability involves stored cross-site scripting (XSS) in the Blocks Plugin of FluentCMS, specifically in the /admin/blocks component. Detection involves identifying malicious scripts injected into the plugin's content fields that execute when accessed.
Since the exploit requires admin privileges to create malicious blocks, detection can focus on monitoring admin actions and inspecting the content of blocks for suspicious scripts.
Suggested commands or approaches include:
- Review the database entries for the Blocks Plugin content fields to identify suspicious script tags or payloads.
- Use web application scanning tools to detect stored XSS vulnerabilities on the /admin/blocks page.
- Monitor HTTP requests and responses to the /admin/blocks endpoint for unusual script injections.
- Check server logs for unusual admin activity or payload submissions.
What immediate steps should I take to mitigate this vulnerability?
Immediate mitigation steps include restricting admin access to trusted users only, as the exploit requires admin privileges to inject malicious scripts.
Additionally, review and sanitize all input fields in the Blocks Plugin, especially the 'Content' field, to prevent script injection.
Implement web application firewall (WAF) rules to detect and block XSS payloads targeting the /admin/blocks endpoint.
Monitor and audit admin activities closely to detect any suspicious block creation or modification.
Since the vendor has not responded, consider applying custom patches or disabling the vulnerable Blocks Plugin until a fix is available.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The vulnerability allows attackers to inject malicious scripts that can lead to session hijacking, credential theft, sensitive data exposure, and other malicious activities.
Such exposure and compromise of sensitive data can negatively impact compliance with data protection regulations like GDPR and HIPAA, which require safeguarding personal and sensitive information against unauthorized access and breaches.
However, the provided information does not explicitly state the direct impact on compliance with these standards.