CVE-2022-50963: uBidAuction 2.0.1 XSS Vulnerability

CVE-2022-50963 Overview

CVE-2022-50963 is a reflected cross-site scripting (XSS) vulnerability in uBidAuction 2.0.1, an AppHP-developed PHP auction script. The flaw exists in the auctions/myAuctions/status/active module, where the date_created, date_from, date_to, and created_at filter parameters are not properly sanitized before being reflected in the response.

Remote attackers can craft malicious GET requests that inject arbitrary JavaScript executing in a victim's browser session. The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation).

Critical Impact

Attackers can hijack authenticated auction sessions, steal cookies, deface filter result pages, or redirect users to attacker-controlled domains via crafted links.

Affected Products

• uBidAuction 2.0.1 (AppHP PHP Classic and Bid Auctions Script)
• Earlier 2.x branches sharing the unsanitized filter logic in auctions/myAuctions/status/active
• Deployments exposing the myAuctions filter parameters (date_created, date_from, date_to, created_at)

Discovery Timeline

• 2026-05-10 - CVE-2022-50963 published to NVD
• 2026-05-12 - Last updated in NVD database

Technical Details for CVE-2022-50963

Vulnerability Analysis

The vulnerability resides in the active view of the myAuctions controller within uBidAuction 2.0.1. The application accepts the date_created, date_from, date_to, and created_at query parameters from the filter form. These values are echoed back into the rendered HTML without contextual output encoding.

Because user-controlled input reaches the response body unfiltered, an attacker can supply payloads containing <script> tags or HTML event handlers. The browser parses the reflected payload as executable script in the application's origin. This grants the attacker access to the Document Object Model (DOM), cookies not marked HttpOnly, and any actions the victim is authorized to perform.

The issue is exploitable over the network, requires no authentication, and depends only on a victim clicking or being redirected to a crafted URL. The scope of impact extends beyond the vulnerable component, affecting the user's session integrity and any linked subsystems within the auction site.

Root Cause

The root cause is missing input sanitization and output encoding on filter parameters consumed by the auctions/myAuctions/status/active endpoint. The PHP code reflects raw GET values into HTML attributes or text nodes without invoking htmlspecialchars() or an equivalent context-aware encoder.

Attack Vector

Exploitation requires the attacker to deliver a crafted URL to an authenticated uBidAuction user. The link embeds JavaScript inside one of the four vulnerable parameters. When the victim visits the URL, the payload executes in their browser under the auction site's origin. See Exploit-DB #50693 and the VulnCheck Advisory on XSS for proof-of-concept details.

// Conceptual reflected XSS request pattern (no verified PoC code reproduced)
GET /auctions/myAuctions/status/active?date_from=<payload>&date_to=<payload> HTTP/1.1
Host: vulnerable-host

Detection Methods for CVE-2022-50963

Indicators of Compromise

• Web server access logs containing requests to /auctions/myAuctions/status/active with <, >, script, onerror, or URL-encoded equivalents in date_created, date_from, date_to, or created_at parameters.
• Outbound browser requests from authenticated users to unfamiliar domains immediately after visiting a uBidAuction filter URL.
• Unexpected JavaScript errors or Content Security Policy (CSP) violation reports referencing the myAuctions page.

Detection Strategies

• Deploy a web application firewall (WAF) rule that inspects the four filter parameters for HTML and JavaScript metacharacters.
• Review historical HTTP logs for GET requests carrying script-like payloads in the affected query string keys.
• Enable browser-side CSP reporting to capture inline script execution attempts on auction pages.

Monitoring Recommendations

• Alert on repeated requests from a single source containing encoded <script>, javascript:, or event-handler patterns against auctions/myAuctions/*.
• Correlate session cookie reuse across geographically distinct IP addresses following exposure to crafted filter URLs.
• Track referer headers pointing to external sites that link directly to the vulnerable endpoint with non-empty filter parameters.

How to Mitigate CVE-2022-50963

Immediate Actions Required

• Restrict access to the auctions/myAuctions/status/active endpoint to authenticated sessions and apply rate limiting.
• Deploy WAF signatures that block HTML and JavaScript metacharacters in date_created, date_from, date_to, and created_at parameters.
• Set the HttpOnly and Secure flags on all session cookies to limit cookie theft via injected script.
• Implement a strict Content Security Policy (CSP) that disallows inline scripts on the auction application.

Patch Information

No vendor patch has been published in the referenced advisories at the time of NVD publication. Review the AppHP Auction Script product page for updated releases, and consult the Vulnerability Lab Report #2289 for vendor coordination status. Operators should validate that any subsequent uBidAuction release applies htmlspecialchars($value, ENT_QUOTES, 'UTF-8') to all reflected filter values.

Workarounds

• Apply server-side input validation that rejects non-date values in date filter parameters using a strict regular expression such as ^\d{4}-\d{2}-\d{2}$.
• Wrap all reflected output in htmlspecialchars() with ENT_QUOTES and the correct character set before rendering.
• Disable or remove the myAuctions filter UI until a vendor fix is available if the feature is not business-critical.

# Example nginx rule to block script-like payloads on the vulnerable endpoint
location /auctions/myAuctions/status/active {
    if ($args ~* "(<|%3C)\s*script|javascript:|onerror=|onload=") {
        return 403;
    }
    proxy_pass http://backend;
}