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AVideo CVE-2026-89254

| EUVDEUVD-2026-76066 CRITICAL
Cross-site Scripting (XSS) (CWE-79)
2026-09-11 VulnCheck GHSA-8cc3-9p8w-vg36
9.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
9.3 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/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
6.9 MEDIUM

Injection needs an administrator so PR:H; stored payload requires the victim to view the page (UI:R) and executes in their browser across a privilege boundary (S:C) with primarily session/confidentiality impact.

3.1 AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/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
Low
User Interaction
P
Scope
X

Lifecycle Timeline

3
POC Analysis Generated
Sep 11, 2026 - 15:27 vuln.today
Analysis Generated
Sep 11, 2026 - 11:52 vuln.today
CVE Published
Sep 11, 2026 - 11:15 cve.org
CRITICAL 9.3

DescriptionCVE.org

AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 contains a stored cross-site scripting vulnerability in the CustomizeUser plugin where the field_name parameter is stored raw without sanitization. Administrators can inject malicious scripts via the add.json.php endpoint that execute when viewing extra info pages or profile forms that render the typeToHTML function.

AnalysisAI

Stored cross-site scripting in WWBN AVideo's CustomizeUser plugin lets an administrator persist an unsanitized field_name value through the add.json.php endpoint, which later executes as script when any user or admin renders the extra-info pages or profile forms via the typeToHTML function. The flaw affects AVideo up through commit c3edcc274c389816d434acadac07ee78eaf330c1 and was reported by VulnCheck; no public exploit identified at time of analysis and it is not in CISA KEV.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
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Exploit
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Install
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C2
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated AVideo administrator account able to reach the CustomizeUser plugin's add.json.php endpoint and supply the field_name parameter (PR:L per CVSS). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 9.3 is driven by network vector, low complexity, and the high subsequent-system impact metrics (SC:H/SI:H) that 4.0 assigns to XSS that pivots into a victim's session. … 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 Upstream fix available (per the GitHub Security Advisory GHSA-7hj4-f9x4-gg7p); a released, tagged patched version is not independently confirmed in the provided data, so track that advisory and upgrade to the first release that incorporates the fix once published. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Identify any WWBN AVideo deployments using the CustomizeUser plugin and disable or uninstall it immediately; review server access logs for suspicious requests to add.json.php endpoint. …

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CVE-2026-89254 vulnerability details – vuln.today

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