CVE-2026-54458VulnerabilityPublished 4 Jun 2026Updated 29 Oct 2026

WWBN AVideo: Unauthenticated Stored DOM Cross-Site Scripting via Per-Client Metadata Broadcast in YPTSocket Plugin

Affects WWBN/AVideoSource GCVE Database

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Authoritative record:CVE-2026-54458· Critical 9.6

Not known to be exploited · CVSS 9.6 Critical : upgrade to 29.1.0 as a priority.

Data as of 29 Oct 2026, 15:08 UTC

CVSS 3.1 base score

9.6Critical

How severe the flaw is on the 0–10 CVSS scale.

Patch: Available – fixed in 29.1.0

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Changed
Confidentiality: High
Integrity: High
Availability: Low

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the impacted component are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 15 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade WWBN/AVideo to 29.1.0.

Affected software

Product	Affected	Fixed in
PackagistWWBN/AVideo	Affected <29.1.0	Fixed in 29.1.0

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AI-suggested

A patch is available in AVideo version 29.1.0 that fixes this vulnerability. Administrators should upgrade to version 29.1.0 or later to remediate the issue. Until patched, disabling the YPTSocket plugin or setting the debugSocket flag to false will prevent the online-users debug panel from rendering and mitigate the attack vector. No other specific mitigations are indicated by the vendor advisory.

Description

A stored DOM Cross-Site Scripting (XSS) vulnerability exists in the YPTSocket plugin of the AVideo platform (WWBN). An unauthenticated attacker can inject arbitrary JavaScript via the webSocketSelfURI and page_title parameters, which are broadcast to all connected administrator clients viewing the YPTSocket online-users debug panel. This occurs because these parameters are stored without validation and later inserted into the DOM using jQuery's append method without proper sanitization. The vulnerability affects versions prior to 29.1.0 and has a CVSS score of 9.6, indicating critical severity.

Impact

An unauthenticated remote attacker can execute arbitrary JavaScript code in the browser context of any administrator currently viewing a page with the YPTSocket online-users debug panel enabled. This can lead to full compromise of the administrator's session, including theft of credentials, session tokens, or performing actions on behalf of the administrator. The vulnerability has a critical impact on confidentiality, integrity, and availability with a CVSS score of 9.6.

Summary

The YPTSocket plugin in AVideo issues a WebSocket token to any caller without authentication, embedding attacker-controlled webSocketSelfURI and page_title parameters into an in-memory SQLite connections table without validation. These values are broadcast to all connected clients and interpolated into HTML template literals on the client side, which are appended to the DOM using jQuery's append method. This allows execution of arbitrary JavaScript in the context of authenticated administrators viewing the online-users debug panel. The vulnerability is a stored DOM XSS (CWE-79) and affects versions before 29.1.0. The issue arises from lack of input validation and improper DOM insertion of untrusted data.

CWE-79Improper Neutralization of Input During Web Page Generation (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #1OWASP Top 10 A05:2025: Injection (opens in a new tab)
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Implementation · Architecture and Design
Understand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages.
Architecture and Design · Implementation · Attack Surface Reduction
Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide…
OWASP Cheat Sheets
Cross Site Scripting Prevention (opens in a new tab)
DOM based XSS Prevention (opens in a new tab)
Injection Prevention (opens in a new tab)
Abuse Case (opens in a new tab)
Deserialization (opens in a new tab)
OWASP ASVS 4.0.3
V5.3.3 (opens in a new tab)
V1.5.1 (opens in a new tab)
Attack patterns
XSS Using MIME Type Mismatch (opens in a new tab)
DOM-Based XSS (opens in a new tab)
Reflected XSS (opens in a new tab)
Stored XSS (opens in a new tab)
Cross-Site Scripting (XSS) (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 29 Oct 2026, 15:08 UTC

WeaknessesCWE-79

Technical details

References

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