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WWBN AVideo CVE-2026-89239

| EUVDEUVD-2026-76051 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-09-11 VulnCheck GHSA-hvjj-pf95-jcvw
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

Network-delivered reflected XSS, no attacker privileges needed, victim must navigate from attacker page (UI:R), scope changes to user browser context (S:C).

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

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

1
Analysis Generated
Sep 11, 2026 - 12:00 vuln.today

DescriptionCVE.org

WWBN AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 contains a reflected cross-site scripting vulnerability in the showAlertMessage() function that inserts the raw Referer header into a JavaScript comment without encoding. Attackers can craft a Referer header containing */ to close the comment and inject arbitrary JavaScript that executes in the site origin for visitors arriving from the attacker-controlled page.

AnalysisAI

Reflected XSS in WWBN AVideo's showAlertMessage() function allows unauthenticated attackers to inject arbitrary JavaScript into the site's execution context by abusing how the raw HTTP Referer header is embedded inside a JavaScript block comment without output encoding. Exploitation requires luring a victim to navigate to AVideo from an attacker-controlled page so the browser automatically includes the crafted Referer header. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
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Delivery
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Exploit
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Install
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C2
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Execute
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Impact
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Vulnerability AssessmentAI

Exploitation The attack requires that a victim navigate to a vulnerable AVideo page directly from an attacker-controlled origin, so the browser sends an attacker-crafted Referer header. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N) scores 5.3, reflecting the medium-severity realistic impact: no privileges required for the attacker (PR:N), but passive user interaction is required (UI:P - victim must navigate from attacker's page). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the fix documented in GitHub Security Advisory GHSA-3pp9-g99w-qw3j at https://github.com/WWBN/AVideo/security/advisories/GHSA-3pp9-g99w-qw3j. … Detailed patch versions, workarounds, and compensating controls in full report.

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An insufficient entropy vulnerability exists in the userRecoverPass.php recoverPass generation functionality of WWBN AVi

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AVideo is an open source video platform. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, low

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CVE-2026-89239 vulnerability details – vuln.today

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