CVE-2026-84477Public exploitNetwork attack vectorHinoki check available

Stored XSS via unescaped live-schedule fields

Published Sep 1, 2026 · Updated Sep 2, 2026

Stored XSS in WWBN AVideo 29.0 and earlier allows remote authenticated users with streaming permission to run script in viewers' browsers. Live_schedule::setTitle() and setDescription() store POST values verbatim, while remindMe.php and modeYoutubeLive.php render the stored fields without output encoding. A streamer can seed a schedule, and any visitor who opens its public reminder page executes the payload; an administrator does so with administrative session context.

CVSS severity5.1
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in WWBN AVideo 29.0 and earlier allows remote authenticated users with streaming permission to run script in viewers' browsers. Live_schedule::setTitle() and setDescription() store POST values verbatim, while remindMe.php and modeYoutubeLive.php render the stored fields without output encoding. A streamer can seed a schedule, and any visitor who opens its public reminder page executes the payload; an administrator does so with administrative session context.

The record

CVE
CVE-2026-84477
Published
Sep 1, 2026
Updated
Sep 2, 2026
Vendor
WWBN
Product
AVideo
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 2, 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=0 <=29.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WWBN · AVideoversion=0 <=29.0

Published CVSS scores

5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
5.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:R/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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