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AVideo TopMenu CVE-2026-56347

| EUVDEUVD-2026-38134 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-06-20 VulnCheck
XSS Avideo
5.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
5.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/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
vuln.today AI
6.1 MEDIUM

CSRF chain eliminates privilege requirement (PR:N); scope changes to all site visitors (S:C); user interaction required for both CSRF admin step and victim page load (UI:R).

3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

2
Source Code Evidence Fetched
Jun 22, 2026 - 06:27 vuln.today
Analysis Generated
Jun 22, 2026 - 06:27 vuln.today

DescriptionCVE.org

AVideo TopMenu plugin through version 26.0 contains a stored cross-site scripting vulnerability in menu item rendering due to missing output encoding of icon classes, URLs, and text labels. Attackers can inject malicious JavaScript through unescaped menu item fields that execute for all site visitors, potentially stealing session cookies or performing unauthorized actions.

AnalysisAI

Stored cross-site scripting in AVideo's TopMenu plugin through version 26.0 allows payload execution for every site visitor due to unescaped rendering of icon classes, URLs, and text labels across multiple PHP templates. Critically, the saving endpoint (menuItemSave.json.php) lacks CSRF token validation despite checking for admin status, enabling a full CSRF-to-stored-XSS chain: an attacker with no account can inject the malicious menu item by luring an authenticated admin to an attacker-controlled page. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Create attacker page with hidden CSRF form
Delivery
Lure authenticated AVideo admin to attacker page
Exploit
CSRF POST saves malicious menu item to AVideo database
Execution
Unescaped payload rendered on every public AVideo page
Persist
Victim user loads any AVideo page
Impact
Attacker JavaScript executes in victim browser stealing session cookies
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Vulnerability AssessmentAI

Exploitation The TopMenu plugin must be installed and enabled on the AVideo instance. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 4.0 base score of 5.3 (AV:N/AC:L/AT:N/PR:N/UI:P) reflects moderate severity, but several factors elevate real-world priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker hosts a webpage containing a hidden cross-origin form that auto-submits a POST to the target AVideo instance's `menuItemSave.json.php` endpoint with a payload injecting `javascript:alert(document.cookie)` as the menu item URL. When an AVideo admin visits the attacker's page while authenticated, their session cookie is silently used to save the malicious menu item. …
Remediation No vendor-released patch has been identified at time of analysis; the Composer package lists no fixed version. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-56347 vulnerability details – vuln.today
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