EUVD-2026-76065
GHSA-hwfm-c6x6-hx7r
Severity by source
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
Authenticated user injects (PR:L), victim must load page and hover the button (UI:R), script runs in another user's browser crossing the security authority boundary (S:C), with typical XSS low C/I impact and no availability effect.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
WWBN AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 contains a stored cross-site scripting vulnerability in the user 'donationLink' profile field. User::setDonationLink() (objects/user.php) stores the value and save() validates it only with filter_var(..., FILTER_VALIDATE_URL), which accepts strings such as http://evil.example/"onmouseover=alert(document.domain)//, while getDonationLink() applies only strip_tags() and does not encode double quotes. plugin/CustomizeUser/actionButton.php echoes the value unencoded into an <a href="..."> attribute, and that button is included from view/modeYoutubeBottom.php on the watch page when the CustomizeUser option allowDonationLink is enabled. An authenticated user who updates their own profile via objects/userUpdate.json.php can therefore break out of the href attribute and inject an event handler that executes JavaScript in the browser of any visitor-including an administrator-who views the attacker's videos and interacts with (for example, hovers over) the donation button. The issue was unfixed at the time of reporting.
Articles & Coverage 1
AnalysisAI
Stored cross-site scripting in WWBN AVideo (through commit c3edcc27) lets an authenticated user poison their own 'donationLink' profile field, which is later rendered unencoded inside an <a href="..."> attribute on the video watch page. Because User::save() validates the value only with FILTER_VALIDATE_URL (which accepts embedded double quotes and event handlers) and getDonationLink() applies only strip_tags(), an attacker can break out of the href attribute and execute JavaScript in the browser of any visitor - including an administrator - who hovers over the donation button. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the CustomizeUser plugin option allowDonationLink to be enabled (this renders the donation button on the watch page); without it the sink is not reached. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The supplied CVSS 4.0 score of 9.3 (VC:H/VI:H/SC:H/SI:H) is high, but this is a stored XSS whose true impact is script execution in a victim's browser session, not direct high-confidentiality/high-integrity compromise of the server - the H impact ratings appear overstated for a DOM-context XSS. … 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 | No vendor-released patch identified at time of analysis - the issue was reported as unfixed. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: disable the donation feature in all WWBN AVideo deployments or restrict profile editing to administrators only, and alert all administrative staff to avoid interacting with donation buttons until this issue is resolved. …
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External POC / Exploit Code
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