Cross-site scripting (XSS) vulnerability in Null HTTP Server 0.5.0 and earlier allows remote attackers to insert arbitrary HTML into a "404 Not Found" response.
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Cross-site scripting (XSS) vulnerability in Null HTTP Server 0.5.0 and earlier allows remote attackers to insert arbitrary HTML into a "404 Not Found" response.
April 2, 2003
April 16, 2026
Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.
Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.
NullLogic Null HTTPd 0.5 - Error Page Cross-Site Scripting
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