---
cve: "CVE-2026-73259"
severity: "MEDIUM"
cvss: 5.4
epss: "0.3%"
vendor: "Cesanta"
kev: false
exploited: false
published: "2026-08-20 18:16:47"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T20:52:34+02:00"
---

# CVE-2026-73259

> 5.4 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Erforderlich | good |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- a9df523f76f43a38bd53b4232b9cfd4c16869e71 (Commit)
- beb73a65a99619ff349c59037ea5197f27c7e533 (Commit)

## Referenzen

- <https://github.com/cesanta/mongoose/security/advisories/GHSA-9cwm-487w-h25w>
- <https://github.com/cesanta/mongoose/pull/3611>
- <https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71>
- <https://github.com/cesanta/mongoose/releases/tag/7.22>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-73259) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_