TI-2026-31940 Aliases CVE-2026-43876 GHSA-g9cm-rxp7-6gv5

Cross-site scripting in WWBN AVideo

MEDIUM 62CWE-79Published 2026-05-11 · Updated 2026-05-13

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

WWBN AVideo is an open source video platform. In versions up to and including 29.0, objects/notifySubscribers.json.php takes the raw message POST parameter and passes it into sendSiteEmail(), which substitutes it directly into an HTML email template (via str_replace on the {message} placeholder) and renders it with PHPMailer::msgHTML(). There is no HTML sanitization, character escaping, or output encoding on the attacker-controlled message between $_POST['message'] and the rendered email. Any authenticated user with upload permission can therefore broadcast arbitrary HTML — phishing links, tracking pixels, CSS/UI spoofing — to every subscriber on their channel (up to 10,000 recipients per invocation). The email is sent From: the platform's configured contact address and wrapped in the site's official logo and title, so attacker-supplied HTML arrives with the appearance of an official platform communication. Commit https://github.com/WWBN/AVideo/commit/ contains an updated fix.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00191 8th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
WWBN	AVideo	up to 29.0	—	No fix listed	CNA
—	wwbn/avideo (Packagist)	up to 29.0	—	No fix listed	GHSA-g9cm-rxp7-6gv5

AVideo VendorWWBN Affected up to 29.0 Fixed in — No fix listed CNA
wwbn/avideo (Packagist) Vendor— Affected up to 29.0 Fixed in — No fix listed GHSA-g9cm-rxp7-6gv5

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:wwbn:avideo::::::::	—	—	WWBN

cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:* Versions — — ·WWBN

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-43876
2026-10-03 Alias added: GHSA-g9cm-rxp7-6gv5

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-43876

Other 3

TI-2026-82233 OS command injection in AVideo-Encoder via forged streamer login CVSS 3.1CRITICAL 10.0
TI-2026-82232 Unauthenticated PHP code injection in AVideo-Encoder installer CVSS 3.1CRITICAL 10.0
TI-2026-29567 Code injection in WWBN AVideo CVSS 3.1CRITICAL 10.0
TI-2026-26095 AVideo Allows Unauthenticated Live Stream Control via Token Verification URL Override in control.json.php CVSS 3.1CRITICAL 9.4
TI-2026-25874 Improper access control in WWBN AVideo CVSS 3.1CRITICAL 10.0
TI-2026-25758 AVideo has an Unauthenticated SQL Injection via `doNotShowCats` Parameter (Backslash Escape Bypass) CVSS 3.1CRITICAL 9.8

See all 364 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences