CVE WatchAug 20, 2026

CVE-2026-73254

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 ca

CVSS

5.4

Medium

EPSS

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KEV

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Exploit Today

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0-100

Published: Aug 20, 2026 · Last modified: Aug 20, 2026 · CWE-79

EPSS · 30d

Not enough EPSS history yet.

Technical description

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.

Official references

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