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…

PriorityP428medium5.4CVSS 3.1

AVNACLPRNUIRSUCLILAN

EPSS

0.28%

20.5th percentile

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.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
cesanta	mongoose	< 7.22	7.22

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