CVE-2026-3576 Details.
Planyo Online Reservation System <= 3.0 - Arbitrary File Read
Atlas does not check this one. Needs a scripted sequence.
This check is a series of requests where each step depends on the last, often after logging in. Atlas runs single, read-only probes, so it does not run this one.
About CVE-2026-3576. What It Means.
The Planyo Online Reservation System plugin for WordPress through 3.0 ships ulap.php, an AJAX proxy that is directly reachable without WordPress bootstrapping or authentication. The send_http_post() function validates the host of the supplied URL against an allowlist that includes localhost, but never validates the URL scheme, so a file://localhost/ URL passes the host check and is handed to curl_init() or fopen(). Both support the file:// wrapper, so the contents of arbitra…
Affected Product. What Is Hit.
- Vendor
- xtreeme
- Product
- Xtreeme Planyo Online Reservation System
References. Where To Read More.
FAQ
Common Questions.
Planyo Online Reservation System <= 3.0 - Arbitrary File Read. The Planyo Online Reservation System plugin for WordPress through 3.0 ships ulap.php, an AJAX proxy that is directly reachable without WordPress bootstrapping or authentication. The send_http_post() function validates the host of the supplied URL against an allowlist that includes localhost, but never validates the URL scheme, so a file://localhost/ URL passes the host check and is handed to curl_init() or fopen(). Both support the file:// wrapper, so the contents of arbitra…
No. This check is a series of requests where each step depends on the last, often after logging in. Atlas runs single, read-only probes, so it does not run this one. The facts about CVE-2026-3576 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
CVE-2026-3576 is not on the CISA Known Exploited Vulnerabilities list at the time of writing, but it is still worth fixing.
Update Xtreeme Planyo Online Reservation System to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. Vendor links are listed on this page when they are known.
This page lists the public facts about CVE-2026-3576. Atlas does not run a check for it, so nothing here says whether a particular site is affected.