CVE-2003-0526: Cross-site scripting (XSS) vulnerability in Microsoft Internet Security and Acceleration (ISA) Server 2000...

Security readout for executives and security teams

CVE-2003-0526 is a cross-site scripting flaw in Microsoft ISA Server 2000 error pages. A crafted URL could cause script content to appear in default 404 or 500 error responses. Business risk is mainly for organizations still running ISA Server 2000, where users could be tricked into interacting with a malicious link. Exposure is likely limited to environments that still operate Microsoft Internet Security and Acceleration Server 2000 with affected default error pages reachable by users or external clients. Treat this as a legacy-system exposure check, not an internet-wide emergency based on the provided evidence. Prioritize if ISA Server 2000 remains in production or protects sensitive user workflows. Mitigation focus: Check Microsoft MS03-028 for the vendor-approved remediation path.; Identify and retire or isolate any remaining ISA Server 2000 deployments.; Review default 404.htm and 500.htm error page handling on ISA Server 2000..

Prepared

Jun 30, 2026, 09:31 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.