CVE-2026-73259

Mongoose is an embedded web server and network library. Prior to 7.22, a remote attacker can send a crafted percent-encoded request path to a deployment using MG_ENABLE_DIRLIST and persuade a user to visit it. The mg_http_serve_dir() and listdir() path in src/http.c places the decoded request URI into the title and h1 elements without HTML entity encoding. The resulting reflected cross-site scripting executes in the Mongoose origin and can expose session data or perform actions as the victim. This issue is fixed in version 7.22.

• CWE-79

• https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71Patch
• https://github.com/cesanta/mongoose/pull/3611Issue Tracking, Patch
• https://github.com/cesanta/mongoose/releases/tag/7.22Release Notes
• https://github.com/cesanta/mongoose/security/advisories/GHSA-9cwm-487w-h25wExploit, Vendor Advisory
• https://github.com/cesanta/mongoose/security/advisories/GHSA-9cwm-487w-h25wExploit, Vendor Advisory

Published

Aug 20, 2026

Last Modified

Oct 18, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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