CVE-2026-73254 — Mongoose: Stored XSS via unescaped filenames in directory listing
Mongoose is an embedded web server and network library. Prior to 7.22, an attacker who can create a file with an HTML payload in its name can trigger stored cross-site scripting…
Published: 2026-08-20 · CVSS: 5.4 · CVSS 3.1
Mongoose is an embedded web server and network library. Prior to 7.22, an attacker who can create a file with an HTML payload in its name can trigger stored cross-site scripting when a user browses a directory served with MG_ENABLE_DIRLIST. The printdirentry() path called by listdir() in src/http.c URL-encodes the href but inserts the raw filesystem filename into the HTML link text. The browser executes the injected markup in the Mongoose origin, which can expose session data or permit actions as the victim. This issue is fixed in version 7.22.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7