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Vulnerabilities CVE-2026-73259

CVE-2026-73259

Medium
Open
TLP:CLEAR

Mongoose: Reflected XSS via decoded URI in directory listing render

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Description

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.

Details

CVSS Score
5.4
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Confidence
90%
Published
Aug 20, 2026
Last Modified
Aug 20, 2026
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