CVE-2026-60092

AVideo (Meet plugin) through commit e8d6119f3cb1b849149906efeb0a41fc024f59f8 contains a stored cross-site scripting vulnerability in the Meet plugin's getMeetInfo.json.php endpoint. When a participant joins a public meeting, the raw HTTP User-Agent header is stored (meet_join_log.user_agent) without sanitization (bypassing AVideo's setter-level xss_esc() layer) and later echoed without output encoding (no htmlspecialchars()) in the Participants management panel, which is accessible to the meeting host and site administrators. An anonymous, unauthenticated attacker can join any public meeting while supplying a User-Agent header containing an HTML/JavaScript payload; the payload is persisted and executes in the privileged, authenticated browser session of the meeting host or a site administrator when they open the participant list. The issue was unpatched at the time of the report.

AVideo (Meet plugin) through commit e8d6119f3cb1b849149906efeb0a41fc024f59f8 contains a stored cross-site scripting vulnerability in the Meet plugin's getMeetInfo.json.php endpoint. When a participant joins a public meeting, the raw HTTP User-Agent header is stored (meet_join_log.user_agent) without sanitization (bypassing AVideo's setter-level xss_esc() layer) and later echoed without output encoding (no htmlspecialchars()) in the Participants management panel, which is accessible to the meeting host and site administrators. An anonymous, unauthenticated attacker can join any public meeting while supplying a User-Agent header containing an HTML/JavaScript payload; the payload is persisted and executes in the privileged, authenticated browser session of the meeting host or a site administrator when they open the participant list. The issue was unpatched at the time of the report.

AVideo (Meet plugin) through commit e8d6119f3cb1b849149906efeb0a41fc024f59f8 contains a stored cross-site scripting vulnerability in the Meet plugin's getMeetInfo.json.php endpoint. When a participant joins a public meeting, the raw HTTP User-Agent header is stored (meet_join_log.user_agent) without sanitization (bypassing AVideo's setter-level xss_esc() layer) and later echoed without output encoding (no htmlspecialchars()) in the Participants management panel, which is accessible to the meeting host and site administrators. An anonymous, unauthenticated attacker can join any public meeting while supplying a User-Agent header containing an HTML/JavaScript payload; the payload is persisted and executes in the privileged, authenticated browser session of the meeting host or a site administrator when they open the participant list. The issue was unpatched at the time of the report.

Summary

The Meet plugin stores the raw HTTP User-Agent header of every meeting participant and later renders it without output encoding in the meeting-management ("Participants") panel that the meeting host and site administrators open. An anonymous, unauthenticated attacker can join any public meeting while sending a User-Agent header containing an HTML payload. The payload is persisted in meet_join_log.user_agent and, when the host or an administrator opens the participant list, is injected verbatim into their DOM, executing attacker-controlled JavaScript in a privileged, authenticated session. This is a cross-privilege stored XSS: an anonymous visitor obtains script execution in the administrator's browser.

Affected versions

WWBN/AVideo at current master commit e8d6119f3cb1b849149906efeb0a41fc024f59f8 (and prior releases shipping the same code path). Not patched at the time of this report.

Privilege required

• Writer (attacker): unauthenticated / anonymous. Joining a public meeting requires no account and no password.
• Victim (trigger): the meeting host or any site administrator who opens the meeting's participant-management panel.

Vulnerable code (file:line)

The stored value is never sanitized on write, then echoed without encoding on read.

Write path — plugin/Meet/Objects/Meet_join_log.php:147:

    public function setUser_agent($user_agent)
    {
        $this->user_agent = $user_agent;
    }

Write path — plugin/Meet/Objects/Meet_join_log.php:177:

    public static function log($meet_schedule_id)
    {
        $log = new Meet_join_log(0);
        $log->setIp(getRealIpAddr());
        $log->setMeet_schedule_id($meet_schedule_id);
        $log->setUser_agent((isMobile() ? "Mobile: " : "") . get_browser_name());
        $log->setUsers_id(User::getId());
        return $log->save();
    }

get_browser_name() (objects/functionsBrowser.php:239 and :242) returns the original-case User-Agent verbatim for any agent not matched to a known browser name:

        return '[Bot] Other '.$user_agent;
    }
    //_error_log("Unknow user agent ($t) IP=" . getRealIpAddr() . " URI=" . getRequestURI());
    return 'Other (Unknown) '.$user_agent;

Only the lowercased match copy is used for classification; the returned string still contains the raw, original $_SERVER['HTTP_USER_AGENT']. Because the value bypasses AVideo's object-setter sanitization layer (unlike Meet_schedule::setTopic(), which calls xss_esc()), the raw bytes reach the database unchanged.

Read path — plugin/Meet/getMeetInfo.json.php:71:

                        echo '<li class="list-group-item">#' . $count . " - " . User::getNameIdentificationById($value['users_id']) . ' <span class="badge">' . $value['created'] . '</span><br><small class="text-muted">' . $value['user_agent'] . '</small></li>';

$value['user_agent'] is concatenated into the HTML with no htmlspecialchars(). The reader endpoint is gated by Meet_schedule::canManageSchedule() (site admin OR the schedule owner), so the value is rendered in a privileged context.

How input reaches the sink

The join that records the log is reachable anonymously through plugin/Meet/iframe.php:11 and :17:

if (!Meet::validatePassword($meet_schedule_id, @$_REQUEST['meet_password'])) {
    header("Location: {$global['webSiteRootURL']}plugin/Meet/confirmMeetPassword.php?meet_schedule_id=$meet_schedule_id");
    exit;
}
$objLive = AVideoPlugin::getObjectData("Live");
Meet_join_log::log($meet_schedule_id);

For a public meeting (public = 2), Meet::validatePassword() returns true for an anonymous request (no password set), so Meet_join_log::log() runs and stores the attacker's User-Agent. On the read side, the host/admin opens the participant modal, whose JavaScript fetches getMeetInfo.json.php and injects the response with jQuery .html() in plugin/Meet/meet_scheduled.php:266: …

AVideo (Meet plugin) through commit e8d6119f3cb1b849149906efeb0a41fc024f59f8 contains a stored cross-site scripting vulnerability in the Meet plugin's getMeetInfo.json.php endpoint. When a participant joins a public meeting, the raw HTTP User-Agent header is stored (meet_join_log.user_agent) without sanitization (bypassing AVideo's setter-level xss_esc() layer) and later echoed without output encoding (no htmlspecialchars()) in the Participants management panel, which is accessible to the meeting host and site administrators. An anonymous, unauthenticated attacker can join any public meeting while supplying a User-Agent header containing an HTML/JavaScript payload; the payload is persisted and executes in the privileged, authenticated browser session of the meeting host or a site administrator when they open the participant list. The issue was unpatched at the time of the report.

AVideo (Meet plugin) through commit e8d6119f3cb1b849149906efeb0a41fc024f59f8 contains a stored cross-site scripting vulnerability in the Meet plugin's getMeetInfo.json.php endpoint. When a participant joins a public meeting, the raw HTTP User-Agent header is stored (meet_join_log.user_agent) without sanitization (bypassing AVideo's setter-level xss_esc() layer) and later echoed without output encoding (no htmlspecialchars()) in the Participants management panel, which is accessible to the meeting host and site administrators. An anonymous, unauthenticated attacker can join any public meeting while supplying a User-Agent header containing an HTML/JavaScript payload; the payload is persisted and executes in the privileged, authenticated browser session of the meeting host or a site administrator when they open the participant list. The issue was unpatched at the time of the report.

Summary

The Meet plugin stores the raw HTTP User-Agent header of every meeting participant and later renders it without output encoding in the meeting-management ("Participants") panel that the meeting host and site administrators open. An anonymous, unauthenticated attacker can join any public meeting while sending a User-Agent header containing an HTML payload. The payload is persisted in meet_join_log.user_agent and, when the host or an administrator opens the participant list, is injected verbatim into their DOM, executing attacker-controlled JavaScript in a privileged, authenticated session. This is a cross-privilege stored XSS: an anonymous visitor obtains script execution in the administrator's browser.

Affected versions

WWBN/AVideo at current master commit e8d6119f3cb1b849149906efeb0a41fc024f59f8 (and prior releases shipping the same code path). Not patched at the time of this report.

Privilege required

• Writer (attacker): unauthenticated / anonymous. Joining a public meeting requires no account and no password.
• Victim (trigger): the meeting host or any site administrator who opens the meeting's participant-management panel.

Vulnerable code (file:line)

The stored value is never sanitized on write, then echoed without encoding on read.

Write path — plugin/Meet/Objects/Meet_join_log.php:147:

    public function setUser_agent($user_agent)
    {
        $this->user_agent = $user_agent;
    }

Write path — plugin/Meet/Objects/Meet_join_log.php:177:

    public static function log($meet_schedule_id)
    {
        $log = new Meet_join_log(0);
        $log->setIp(getRealIpAddr());
        $log->setMeet_schedule_id($meet_schedule_id);
        $log->setUser_agent((isMobile() ? "Mobile: " : "") . get_browser_name());
        $log->setUsers_id(User::getId());
        return $log->save();
    }

get_browser_name() (objects/functionsBrowser.php:239 and :242) returns the original-case User-Agent verbatim for any agent not matched to a known browser name:

        return '[Bot] Other '.$user_agent;
    }
    //_error_log("Unknow user agent ($t) IP=" . getRealIpAddr() . " URI=" . getRequestURI());
    return 'Other (Unknown) '.$user_agent;

Only the lowercased match copy is used for classification; the returned string still contains the raw, original $_SERVER['HTTP_USER_AGENT']. Because the value bypasses AVideo's object-setter sanitization layer (unlike Meet_schedule::setTopic(), which calls xss_esc()), the raw bytes reach the database unchanged.

Read path — plugin/Meet/getMeetInfo.json.php:71:

                        echo '<li class="list-group-item">#' . $count . " - " . User::getNameIdentificationById($value['users_id']) . ' <span class="badge">' . $value['created'] . '</span><br><small class="text-muted">' . $value['user_agent'] . '</small></li>';

$value['user_agent'] is concatenated into the HTML with no htmlspecialchars(). The reader endpoint is gated by Meet_schedule::canManageSchedule() (site admin OR the schedule owner), so the value is rendered in a privileged context.

How input reaches the sink

The join that records the log is reachable anonymously through plugin/Meet/iframe.php:11 and :17:

if (!Meet::validatePassword($meet_schedule_id, @$_REQUEST['meet_password'])) {
    header("Location: {$global['webSiteRootURL']}plugin/Meet/confirmMeetPassword.php?meet_schedule_id=$meet_schedule_id");
    exit;
}
$objLive = AVideoPlugin::getObjectData("Live");
Meet_join_log::log($meet_schedule_id);

For a public meeting (public = 2), Meet::validatePassword() returns true for an anonymous request (no password set), so Meet_join_log::log() runs and stores the attacker's User-Agent. On the read side, the host/admin opens the participant modal, whose JavaScript fetches getMeetInfo.json.php and injects the response with jQuery .html() in plugin/Meet/meet_scheduled.php:266: …