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CVE-2026-73254

CVE-2026-73254 · Mongoose: Stored XSS via unescaped filenames in directory listing

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 5.4 · Medium · EPSS 0.3% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • mongoose

    Versions
    • < 7.22: Affected

    No fix published

  • mongoose Debian:14

    Versions
    • 7.21+ds-1
    • 7.21+ds-1~bpo13+1
    • 7.21+ds-2
    • 7.22+ds-1~bpo13+1
    Affected ranges
    • ECOSYSTEM: < 7.22+ds-1

    Update to 7.22+ds-1

  • mongoose Ubuntu:26.10

    Versions
    • 7.21+ds-1
    • 7.21+ds-2
    • 7.22+ds-1
    • 7.23+ds-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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