What is the CVSS score of EUVD-2026-17646?

EUVD-2026-17646 has a CVSS 3.1 base score of 6.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Avideo EUVD-2026-17646

| CVE-2026-34716 MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-03-31 GitHub_M

GHSA-w4hp-w536-jg64

XSS RCE Avideo

6.4

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.4 MEDIUM

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

EUVD ID Assigned

Mar 31, 2026 - 21:14 euvd

EUVD-2026-17646

Analysis Generated

Mar 31, 2026 - 21:14 vuln.today

CVE Published

Mar 31, 2026 - 20:49 nvd

MEDIUM 6.4

DescriptionGitHub Advisory

WWBN AVideo is an open source video platform. In versions 26.0 and prior, the AVideo YPTSocket plugin's caller feature renders incoming call notifications using the jQuery Toast Plugin, passing the caller's display name directly as the heading parameter. The toast plugin constructs the heading as raw HTML ('<h2>' + heading + '</h2>') and inserts it into the DOM via jQuery's .html() method, which parses and executes any embedded HTML or script content. An attacker can set their display name to an XSS payload and trigger code execution on any online user's browser simply by initiating a call - no victim interaction is required beyond being connected to the WebSocket. At time of publication, there are no publicly available patches.

AnalysisAI

Stored cross-site scripting (XSS) in WWBN AVideo versions 26.0 and prior allows authenticated attackers to execute arbitrary JavaScript in the browsers of online users without any victim interaction. An attacker with a user account can set their display name to an XSS payload; when they initiate a call via the YPTSocket plugin, the caller notification rendered by the jQuery Toast Plugin executes the malicious script in every connected user's browser, enabling session hijacking, credential theft, or further compromise. CVSS 6.4 reflects moderate complexity due to authentication requirement and limited direct impact scope.

Technical ContextAI

WWBN AVideo's YPTSocket plugin implements real-time call notifications using the jQuery Toast Plugin library. The vulnerability stems from unsafe DOM manipulation in the notification rendering logic: the plugin passes the caller's display name directly to the toast heading parameter without sanitization, and the jQuery Toast Plugin constructs the heading using string concatenation ('<h2>' + heading + '</h2>') before inserting it via jQuery's .html() method. The .html() method parses and executes embedded HTML and JavaScript, bypassing Content Security Policy protections if not configured. This is a classic example of CWE-79 (Improper Neutralization of Input During Web Page Generation) where user-controlled data enters an unsafe rendering pipeline. The attack requires WebSocket connectivity, meaning the victim must be actively logged into the AVideo platform and the attacker must have a valid user account to establish call signaling.

RemediationAI

At the time of this analysis, no vendor-released patch is available per the official GitHub Security Advisory (https://github.com/WWBN/AVideo/security/advisories/GHSA-w4hp-w536-jg64). Users should implement immediate mitigations: (1) Implement Content Security Policy (CSP) headers with 'script-src' restricting inline and eval execution to prevent XSS payload execution, though this does not address the root cause; (2) Disable or restrict the YPTSocket plugin/caller feature if not essential; (3) Enforce strict input validation on display name fields server-side, sanitizing all HTML special characters (< > & ' ") before storage and rendering; (4) Apply HTML entity encoding to the display name output before inserting into the DOM, replacing the unsafe .html() call with .text() or proper escaping libraries. Monitor the GitHub Security Advisory for patched version announcements and upgrade immediately upon availability. Contact WWBN support for guidance on patch timelines.