Is CVE-2026-43876 actively exploited?

No active exploitation of CVE-2026-43876 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-43876 be exploited remotely?

Yes. CVE-2026-43876 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-43876?

CVE-2026-43876 has a CVSS score of 6.4 (MEDIUM).

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MEDIUM

CVE-2026-43876

CWE-79Published: May 11, 2026· Updated: May 13, 2026

6.4

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.3th

Official 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.

NVD Source

Technical Analysis

CVE-2026-43876 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.