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FluentCMS CVE-2026-11434

| EUVD-2026-34969 LOW
Cross-site Scripting (XSS) (CWE-79)
2026-06-06 VulDB GHSA-gp2j-q325-2c8q
XSS Fluentcms
1.9
CVSS 4.0 · NVD

Severity by source

NVD PRIMARY
1.9 LOW
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
P
Scope
X

Lifecycle Timeline

2
CVSS changed
Jun 06, 2026 - 15:22 NVD
2.4 (LOW) 1.9 (LOW)
Analysis Generated
Jun 06, 2026 - 15:20 vuln.today

DescriptionCVE.org

A weakness has been identified in FluentCMS 0.0.5. The impacted element is an unknown function of the file /admin/blocks of the component Blocks Plugin. This manipulation causes cross site scripting. The attack may be initiated remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

AnalysisAI

Cross-site scripting in FluentCMS 0.0.5 allows a remote, highly-privileged attacker to inject malicious JavaScript via the /admin/blocks endpoint of the Blocks Plugin. The attack requires high privileges (admin-level authentication) and victim user interaction, constraining real-world impact significantly - the CVSS base score of 2.4 reflects this narrow exploitation surface. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker obtains admin credentials
Delivery
Authenticates to FluentCMS admin panel
Exploit
Injects XSS payload into /admin/blocks Blocks Plugin field
Execution
Victim admin user views manipulated block content
Impact
Malicious script executes in victim browser session
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Vulnerability AssessmentAI

Exploitation Exploitation requires the attacker to already hold high-privilege (admin-level) credentials on the FluentCMS instance (CVSS PR:H) - this is not an unauthenticated attack path. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The composite risk profile for this vulnerability is low. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who already holds admin-level credentials to a FluentCMS 0.0.5 instance navigates to the /admin/blocks interface and injects a malicious JavaScript payload into an input field processed by the Blocks Plugin. When another authenticated user with admin privileges views the manipulated block content, the injected script executes within their browser session. …
Remediation No vendor-released patch has been identified at time of analysis - the vendor did not respond to the initial disclosure, and no fix version appears in the referenced advisories (https://vuldb.com/vuln/369014). … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-11434 vulnerability details – vuln.today
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