CVE-2026-45580: WWBN AVideo Live: stored XSS via unescaped stream key in modeYoutubeLive.php class attribute
WWBN AVideo is an open source video platform. In 29.0 and earlier, there is a stored cross-site scripting vulnerability. The Live plugin's "YouTube-style" view renders the live transmission's stream key into an HTML class attribute by raw echo, without htmlspecialchars(). A canStream user can persist a key containing " plus an event handler via plugin/Live/saveLive.php, and any visitor (logged in or anonymous) opening the stream's live page executes attacker JavaScript in the platform origin.
Security readout for executives and security teams
Plain-English summary
WWBN AVideo 29.0 and earlier can store unsafe script content in a live stream key. When someone opens the affected live page, the script can run in that visitor's browser under the AVideo site. This can expose user session context or alter page behavior, but the attacker needs a canStream account first.
Executive priority
Prioritize this for AVideo platforms that allow external creators or broad streaming permissions. It is not a critical infrastructure-level flaw, but it can affect visitors and authenticated users in the site's trusted origin, so remediation should be scheduled promptly.
Technical view
The Live plugin's YouTube-style view places a transmission stream key into an HTML class attribute without escaping. A user with canStream permission can save a crafted key through saveLive.php. Later page views execute attacker-controlled JavaScript in the platform origin. The issue is CWE-79 stored XSS with CVSS 3.1 score 5.4.
Likely exposure
Internet-facing AVideo sites running version 29.0 or earlier are potentially exposed, especially where untrusted or many users have canStream permission. Exposure depends on use of the Live plugin and the YouTube-style live page path described in the advisory.
Exploitation context
The source bundle does not show KEV listing or active exploitation evidence. Exploitation requires authenticated canStream privileges and a victim visiting the affected live page, including anonymous visitors. No public weaponization details should be assumed from these sources.
Researcher notes
Evidence is strongest for the vulnerable render path and prerequisite permission. The sources do not name a fixed version, patch commit, or confirmed exploitation. Validation should focus on affected version, Live plugin usage, canStream users, and stored key hygiene without reproducing executable payloads.
Mitigation direction
Check WWBN AVideo advisory and release guidance for the vendor-approved fix.
Limit canStream permission to trusted accounts until remediation is complete.
Disable or restrict affected Live plugin views if operationally acceptable.
Review saved live stream keys for suspicious HTML-breaking content.
Monitor AVideo releases for fixes beyond affected versions <= 29.0.
Validation and detection
Inventory AVideo deployments and confirm whether version is 29.0 or earlier.
Confirm whether the Live plugin and YouTube-style live view are enabled.
Review which users or roles have canStream permission.
Inspect stored live transmission keys without rendering them in a browser.
Check access logs for unusual live page visits after stream key changes.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Potential ATT&CK relevance
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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cwe · medium confidence lookup
CWE-79: User-session and phishing behavior lookup
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CWE-79 · source CWE mapping
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.