CVE-2026-40911Public exploitNetwork attack vector

Unauthenticated cross-user code execution via WebSocket broadcasts

Published Apr 21, 2026 · Updated Apr 21, 2026

Code injection in AVideo 29.0 and earlier allows remote attackers to execute JavaScript in connected users' browser sessions via YPTSocket. YPTSocket's relay copies untrusted msg and callback fields into browser frames, where script.js passes them to two eval sinks. The plugin must be enabled and a victim must be connected; anonymous token issuance permits session theft and privileged actions.

CVSS severity10.0
Critical
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in AVideo 29.0 and earlier allows remote attackers to execute JavaScript in connected users' browser sessions via YPTSocket. YPTSocket's relay copies untrusted msg and callback fields into browser frames, where script.js passes them to two eval sinks. The plugin must be enabled and a victim must be connected; anonymous token issuance permits session theft and privileged actions.

The record

CVE
CVE-2026-40911
Published
Apr 21, 2026
Updated
Apr 21, 2026
Vendor
World Wide Broadcast Network
Product
AVideo
Classifications
CWE-94, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 29.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

World Wide Broadcast Network · AVideoversion=<= 29.0

Published CVSS scores

10.0GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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