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The MPC::HexToNum function in helpctr.exe in Microsoft Windows Help and Support Center in Windows XP and Windows Server 2003 does not properly handle malformed escape sequences, which allows remote attackers to bypass the trusted documents whitelist (fromHCP option) and execute arbitrary commands via a crafted hcp:// URL, aka "Help Center URL Validation Vulnerability."
Use CWE-78, Microsoft vendor hub and Windows 2003 Server product page to widen CVE-2010-1885 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2015-1701, CVE-2015-2370 and CVE-2015-2365 for nearby disclosures in the same product family. Additional editorial context is available in Weekly Security Roundup: Navigating the April 2026 Threat Landscape and Critical Framework Exploits.