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CVE-2026-3576— Planyo online reservation system <= 3.0 - Unauthenticated Server-Side Request Forgery via 'ulap_url' Parameter

Quick assessment

Affected
xtreeme Planyo online reservation system
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress Planyo online reservation system是WordPress基金会的一款在线预约系统。 WordPress Planyo online reservation system 3.0及之前版本存在输入验证错误漏洞，该漏洞源于ulap.php文件中的send_http_post()函数未能验证URL协议/方案，可能导致未经身份验证的攻击者通过file:// URL读取服务器任意本地文件。

CVSS 7.2 · High EPSS 8.81% · P95

Affected Version Matrix 1

VendorProduct Version RangeStatus
xtreeme Planyo online reservation system ≤ 3.0 affected
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I. Basic Information for CVE-2026-3576

Vulnerability Information
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Vulnerability Title
Planyo online reservation system <= 3.0 - Unauthenticated Server-Side Request Forgery via 'ulap_url' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Planyo Online Reservation System plugin for WordPress is vulnerable to Server-Side Request Forgery leading to Local File Inclusion in all versions up to, and including, 3.0. The ulap.php file acts as an AJAX proxy and is directly accessible without WordPress bootstrapping or any authentication. The send_http_post() function validates the host of the provided URL against an allowlist that includes 'localhost', but critically fails to validate the URL scheme/protocol. This makes it possible for unauthenticated attackers to supply a file:// URL (e.g., file://localhost/etc/passwd) which bypasses the host allowlist check because parse_url() returns 'localhost' as the host. The URL is then passed to curl_init() or fopen(), both of which support the file:// protocol, allowing the attacker to read arbitrary local files on the server and have their contents returned in the HTTP response. This can lead to disclosure of sensitive files such as /etc/passwd, wp-config.php (containing database credentials and authentication keys), and other server-side files.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Planyo online reservation system 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Planyo online reservation system是WordPress基金会的一款在线预约系统。 WordPress Planyo online reservation system 3.0及之前版本存在输入验证错误漏洞，该漏洞源于ulap.php文件中的send_http_post()函数未能验证URL协议/方案，可能导致未经身份验证的攻击者通过file:// URL读取服务器任意本地文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
xtreeme Planyo online reservation system 0 ~ 3.0 -

II. Public POCs for CVE-2026-3576

# POC Description Source Link Shenlong Link
1 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 arbitrary local files are returned in the response. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-3576.yaml POC Details
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III. Intelligence Information for CVE-2026-3576

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Patches & Fixes for CVE-2026-3576 (3)

News Coverage for CVE-2026-3576 (1)

Vendor Pages for CVE-2026-3576 (1)

Other References for CVE-2026-3576 (1)

IV. Related Vulnerabilities

Same product: Planyo online reservation system
Same vendor: xtreeme
Same weakness: CWE-20

V. Comments for CVE-2026-3576

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