Cross-Site Scripting Vulnerability in FluentCMS by Fluent
CVE-2026-11434

4.8MEDIUM

Key Information:

Vendor

Fluent

Status
Fluentcms
Vendor
CVE Published:
6 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-11434?

A security weakness has been detected in FluentCMS version 0.0.5, specifically affecting a function in the /admin/blocks file of the Blocks Plugin. This vulnerability enables attackers to execute cross-site scripting (XSS) attacks, which can be initiated remotely. The exploit has been publicly disclosed, posing significant risks to users of the affected software. Despite early notification, the vendor did not provide a response regarding this potential threat.

Affected Version(s)

FluentCMS 0.0.5

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-11434 - Proof of Concept

CVE-2026-11434 - Proof of Concept

References

https://vuldb.com/vuln/369014
vdb-entry
https://vuldb.com/vuln/369014/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-11434
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Karina Gante
karinagante (VulDB User)
VulDB CNA Team
.