CVE-2022-50965: uBidAuction XSS Vulnerability

CVE-2022-50965 Overview

CVE-2022-50965 is a reflected cross-site scripting (XSS) vulnerability affecting uBidAuction 2.0.1, a PHP-based auction script distributed by AppHP. The flaw resides in the posts/manage module, where the date_created, date_from, date_to, and created_at filter parameters are not properly sanitized before being reflected into the rendered page. Remote attackers can craft malicious GET requests that execute arbitrary JavaScript in the browser of any user who follows the link, classified under [CWE-79].

Critical Impact

Successful exploitation enables session theft, administrative action hijacking, and credential phishing through script execution in an authenticated victim's browser.

Affected Products

• uBidAuction 2.0.1
• AppHP uBidAuction PHP Classic and Bid Auctions Script
• Deployments exposing the posts/manage filter module

Discovery Timeline

• 2026-05-10 - CVE-2022-50965 published to NVD
• 2026-05-12 - Last updated in NVD database

Technical Details for CVE-2022-50965

Vulnerability Analysis

The vulnerability is a reflected XSS flaw in the post management filter interface of uBidAuction 2.0.1. The application accepts user-supplied date filter values through GET parameters and writes them back into the HTML response without applying contextual output encoding or input validation. Because the response reflects attacker-controlled content into an executable context, supplying JavaScript payloads in place of valid date strings causes the browser to execute the injected code in the application's origin.

Root Cause

The root cause is missing output encoding on the date_created, date_from, date_to, and created_at request parameters within the posts/manage module. The application trusts these values as date strings but never enforces a date format or escapes HTML special characters before rendering, violating standard output-encoding requirements for [CWE-79].

Attack Vector

An attacker crafts a URL targeting the posts/manage endpoint with a JavaScript payload embedded in one of the vulnerable date parameters. The attacker delivers the link through phishing, forum posts, or chat messages. When an authenticated administrator or user follows the link, the payload executes in their browser session, enabling cookie theft, CSRF-style actions against the auction backend, or redirection to attacker-controlled infrastructure. User interaction is required, which is consistent with reflected XSS exploitation patterns.

The vulnerability mechanism is described in the VulnCheck Advisory: Reflected XSS and the Exploit-DB #50693 entry. No verified exploit code is reproduced here.

Detection Methods for CVE-2022-50965

Indicators of Compromise

• GET requests to posts/manage containing <script>, onerror=, onload=, or javascript: substrings in the date_created, date_from, date_to, or created_at parameters.
• URL-encoded payload markers such as %3Cscript%3E, %3Cimg, or %22%3E appearing in date filter parameters in web server access logs.
• Outbound requests from administrator browsers to unfamiliar domains immediately after accessing auction management URLs.

Detection Strategies

• Inspect web server and reverse proxy logs for date-filter parameters whose values do not match an expected YYYY-MM-DD regex pattern.
• Deploy web application firewall (WAF) signatures that flag HTML tag characters and JavaScript event handlers inside GET parameters bound to the posts/manage route.
• Correlate referrer headers and click-through patterns to identify externally delivered links targeting the vulnerable endpoint.

Monitoring Recommendations

• Alert on anomalous administrator session activity following access to posts/manage URLs containing non-date characters in date parameters.
• Monitor browser-based telemetry and Content Security Policy (CSP) violation reports for inline script execution on auction management pages.
• Track repeat requests to the posts/manage endpoint from the same source IP within short time windows.

How to Mitigate CVE-2022-50965

Immediate Actions Required

• Restrict access to the posts/manage administrative interface using IP allow-lists or VPN-only access until a patched build is deployed.
• Deploy a WAF rule that rejects requests to posts/manage whose date parameters contain characters outside 0-9 and -.
• Set the HttpOnly and Secure flags on session cookies to limit the impact of script execution.

Patch Information

No vendor patch information is published in the NVD record at the time of writing. Administrators should consult the AppHP Auction Script Details page for current vendor updates and the Vulnerability Lab Report #2289 for additional disclosure details.

Workarounds

• Implement server-side input validation that enforces a strict date format on date_created, date_from, date_to, and created_at.
• Apply context-aware HTML output encoding on all reflected request parameters in the posts/manage view.
• Enforce a strong Content Security Policy that blocks inline scripts and restricts script sources to trusted origins.

# Example Apache mod_rewrite rule to reject non-date values in vulnerable parameters
RewriteEngine On
RewriteCond %{QUERY_STRING} (date_created|date_from|date_to|created_at)=([^&]*[^0-9\-][^&]*) [NC]
RewriteRule ^posts/manage - [F,L]