CVE-2026-43882

AVideo: Unauthenticated CRLF/ICS Injection in Scheduler downloadICS.php Allows Calendar Event Spoofing

• Same-origin calendar phishing. The .ics is served from the trusted AVideo domain, bypassing URL-reputation checks and email-filter suspicion of attacker-hosted attachments.
• Arbitrary event spoofing. Attacker controls SUMMARY, DTSTART, DTEND, URL, LOCATION, DESCRIPTION, and may add further ICS properties (e.g. ORGANIZER, ATTENDEE). Many mainstream calendar clients display the URL field as a clickable link in the event body.
• Integrity: Low, unwanted/forged events are added to the victim's calendar after they import the file.
• Auth: None. Precondition is only that the Scheduler plugin is enabled, which is typical on deployments that use AVideo's scheduled streaming features.
• Confidentiality / Availability: No direct impact.

Not a higher-severity response-splitting bug: PHP's header() blocks CRLF in response headers since 5.1.2, so the CRLF bytes do not escape into HTTP headers, only into the ICS body.

CVE-2026-43882 has a CVSS score of 4.3 (Medium). The vector is network-reachable, no privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. No fixed version is listed yet, so configuration controls and monitoring matter more in the interim.

Kodem intelligence

Strip or RFC-5545-encode CR/LF in ICS::escape_string() so newline bytes cannot break out of a property line. In objects/ICS.php:167-169:

private function escape_string($str) {
    // RFC 5545 §3.3.11: escape backslash, semicolon, comma; encode newlines as \n
    $str = str_replace(array("\\", "\r\n", "\r", "\n"), array("\\\\", "\\n", "\\n", "\\n"), $str);
    return preg_replace('/([\,;])/', '\\\\$1', $str);
}

Additionally, plugin/Scheduler/downloadICS.php should either require authentication or at minimum apply strict input validation (length caps, character whitelists) on title, description, and joinURL, and joinURL should continue to be validated via isValidURL() (already done) before emission. Consider adding a defence-in-depth strip of CR/LF on every $_REQUEST parameter used by Scheduler::downloadICS().

1. What is CVE-2026-43882? CVE-2026-43882 is a medium-severity security vulnerability in wwbn/avideo (composer), affecting versions <= 29.0. No fixed version is listed yet.
2. How severe is CVE-2026-43882? CVE-2026-43882 has a CVSS score of 4.3 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of wwbn/avideo are affected by CVE-2026-43882? wwbn/avideo (composer) versions <= 29.0 is affected.
4. Is there a fix for CVE-2026-43882? No fixed version is listed for CVE-2026-43882 yet. Monitor the advisory for updates and apply mitigations in the interim.
5. Is CVE-2026-43882 exploitable, and should I be worried? Whether CVE-2026-43882 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2026-43882 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.