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CVE-2026-43876— WWBN AVideo: HTML Injection in notifySubscribers.json.php Enables Platform-Branded Phishing Emails to Channel Subscribers

Quick assessment

Affected
WWBN AVideo
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WWBN AVideo是WWBN团队的一个由PHP编写的视频平台建站系统。 WWBN AVideo 29.0及之前版本存在跨站脚本漏洞，该漏洞源于objects/notifySubscribers.json.php未对用户输入进行HTML清理，可能导致认证用户向订阅者广播任意HTML内容。

CVSS 6.4 · Medium EPSS 0.26% · P17

Affected Version Matrix 1

VendorProduct Version RangeStatus
WWBN AVideo <= 29.0 affected
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I. Basic Information for CVE-2026-43876

Vulnerability Information
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Vulnerability Title
WWBN AVideo: HTML Injection in notifySubscribers.json.php Enables Platform-Branded Phishing Emails to Channel Subscribers
Source: CVE Program / CVE List V5
Vulnerability Description
WWBN AVideo is an open source video platform. In versions up to and including 29.0, objects/notifySubscribers.json.php takes the raw message POST parameter and passes it into sendSiteEmail(), which substitutes it directly into an HTML email template (via str_replace on the {message} placeholder) and renders it with PHPMailer::msgHTML(). There is no HTML sanitization, character escaping, or output encoding on the attacker-controlled message between $_POST['message'] and the rendered email. Any authenticated user with upload permission can therefore broadcast arbitrary HTML — phishing links, tracking pixels, CSS/UI spoofing — to every subscriber on their channel (up to 10,000 recipients per invocation). The email is sent From: the platform's configured contact address and wrapped in the site's official logo and title, so attacker-supplied HTML arrives with the appearance of an official platform communication. Commit https://github.com/WWBN/AVideo/commit/ contains an updated fix.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
WWBN AVideo 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WWBN AVideo是WWBN团队的一个由PHP编写的视频平台建站系统。 WWBN AVideo 29.0及之前版本存在跨站脚本漏洞，该漏洞源于objects/notifySubscribers.json.php未对用户输入进行HTML清理，可能导致认证用户向订阅者广播任意HTML内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
WWBN AVideo <= 29.0 -

II. Public POCs for CVE-2026-43876

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III. Intelligence Information for CVE-2026-43876

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Patches & Fixes for CVE-2026-43876 (1)

Vendor Advisories for CVE-2026-43876 (1)

Same Patch Batch · WWBN · 2026-05-11 · 13 CVEs total

CVE-2026-43884 7.7 HIGH WWBN AVideo: SSRF Protection Bypass via HTTP Redirect and DNS Rebinding in isSSRFSafeURL()
CVE-2026-43873 7.5 HIGH WWBN AVideo: Unauthenticated Disclosure of CloneSite `myKey` via Error Echo in `cloneClien
CVE-2026-43874 7.2 HIGH WWBN AVideo: Incomplete Fix for YPTSocket autoEvalCodeOnHTML Strip: Unauthenticated Cross-
CVE-2026-43875 6.8 MEDIUM WWBN AVideo: Password Hash Leaked in MobileManager OAuth Redirect URL Enables Account Take
CVE-2026-43878 6.1 MEDIUM WWBN AVideo: Reflected XSS in plugin/Meet/iframe.php via Unescaped `user`/`pass` Parameter
CVE-2026-43879 5.4 MEDIUM WWBN AVideo: Blind SSRF in YPTWallet Donation Webhook via Missing isSSRFSafeURL() Check an
CVE-2026-43877 5.4 MEDIUM WWBN AVideo: CSRF in userSavePhoto.php Allows Cross-Origin Overwrite of Any Logged-in User
CVE-2026-43881 5.3 MEDIUM WWBN AVideo: Unauthenticated User Enumeration in `objects/users.json.php` via `isCompany`
CVE-2026-43880 5.3 MEDIUM WWBN AVideo: Unauthenticated Arbitrary Email Sending via sendEmail.json.php Allows Phishin
CVE-2026-43882 4.3 MEDIUM WWBN AVideo: Unauthenticated CRLF/ICS Injection in Scheduler downloadICS.php Allows Calend
CVE-2026-43883 4.2 MEDIUM WWBN AVideo: IDOR in PayPalYPT agreementCancel.json.php Allows Any Authenticated User to C
CVE-2026-43885 WWBN AVideo: Exposure of Sensitive Information to an Unauthorized Actor and Missing Author

IV. Related Vulnerabilities

Same product: AVideo
Same vendor: WWBN
Same weakness: CWE-79

V. Comments for CVE-2026-43876

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