CVE-2026-3576: CWE-20 Improper Input Validation in xtreeme Planyo online reservation system
Description
The Planyo Online Reservation System WordPress plugin (versions up to and including 3.0) contains a Server-Side Request Forgery (SSRF) vulnerability that allows unauthenticated attackers to read arbitrary local files. The vulnerability arises because the plugin's AJAX proxy endpoint does not properly validate URL schemes, permitting file:// URLs to bypass host allowlist checks and access sensitive server files such as /etc/passwd and wp-config.php.
CVSS v3.1
Score 7.2high
Affected software
xtreeme
Planyo online reservation system
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-3576 is an SSRF vulnerability in the Planyo Online Reservation System WordPress plugin affecting all versions up to 3.0. The vulnerability exists in the ulap.php file, which acts as an AJAX proxy accessible without authentication or WordPress bootstrapping. The send_http_post() function attempts to validate the host of the provided URL against an allowlist including 'localhost' but fails to validate the URL scheme. This allows attackers to supply file:// URLs that bypass the host check because parse_url() returns 'localhost' as the host. The URL is then passed to curl_init() or fopen(), which support file://, enabling arbitrary local file read and disclosure of sensitive server files.
Potential Impact
An unauthenticated attacker can exploit this vulnerability to read arbitrary local files on the server hosting the Planyo plugin. This can lead to disclosure of sensitive information such as system files (/etc/passwd) and WordPress configuration files (wp-config.php) that contain database credentials and authentication keys. The vulnerability has a CVSS 3.1 base score of 7.2 (High), reflecting network attack vector, no privileges required, no user interaction, and partial confidentiality and integrity impact.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the ulap.php endpoint and consider disabling the plugin or the vulnerable functionality. Monitor for updates from the vendor xtreeme regarding an official fix. Avoid exposing the plugin to untrusted networks.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-03-04T21:44:03.501Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Indicators of Compromise
Exploit Source Code
Exploit code for Planyo_Online_Reservation_System 3.0 - Arbitrary File Read via SSRF
# Exploit Title: Planyo_Online_Reservation_System 3.0 - Arbitrary File Read via SSRF # Date: 12-07-2026 # Exploit Author: Balachandar Gowrisankar # Vendor Homepage: https://www.planyo.com/wordpress-reservation-system/ # Software Link: https://plugins.svn.wordpress.org/planyo-online-reservation-system/tags/2.9/ # Version: <= 3.0 # Tested on: Kali GNU/Linux Rolling, Wordpress 7.0.1, Apache 2.4.68, Python 3.13.14 # CVE: CVE-2026-3576 # CVSS Score: 7.2 # Usage: python exploit.py http://127.0.0.1/w... (2225 more characters)
Threat ID: 6a51c78468715ace4321ea08
Added to database: 07/11/2026, 04:33:08 UTC
Last enriched: 08/11/2026, 21:08:59 UTC
Last updated: 10/06/2026, 06:48:17 UTC
Views: 135
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