CVE-2026-43874Public exploitNetwork attack vector

Unauthenticated cross-user JavaScript execution via relay bypass

Published May 11, 2026 · Updated May 11, 2026

Code injection in AVideo 29.0 and earlier allows remote attackers to execute JavaScript in logged-in users' browsers via WebSocket messages. The YPTSocket handlers strip autoEvalCodeOnHTML only from the msg carrier, while msgToResourceId prioritizes an unfiltered top-level json carrier that the client passes to eval(). An unauthenticated attacker can obtain a WebSocket token, but execution requires targeting a logged-in user and is confined to that user's browser context.

CVSS severity7.2
High
EPSS probability0.25%
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 logged-in users' browsers via WebSocket messages. The YPTSocket handlers strip autoEvalCodeOnHTML only from the msg carrier, while msgToResourceId prioritizes an unfiltered top-level json carrier that the client passes to eval(). An unauthenticated attacker can obtain a WebSocket token, but execution requires targeting a logged-in user and is confined to that user's browser context.

The record

CVE
CVE-2026-43874
Published
May 11, 2026
Updated
May 11, 2026
Vendor
World Wide Broadcast Network
Product
AVideo
Classifications
CWE-94, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 11, 2026CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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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

7.2GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

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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