---
cve: "CVE-2026-100522"
severity: "MEDIUM"
cvss: 5.1
epss: "0.2%"
vendor: "Cotonti"
kev: false
exploited: false
published: "2026-09-26 00:59:23"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-27T06:17:07+02:00"
---

# CVE-2026-100522

> 5.1 MEDIUM · 🧪 PoC

## Beschreibung

Cotonti through 1.0.0 contains a reflected cross-site scripting vulnerability in message.php where the lng parameter is not properly escaped before output in the confirmation dialog. Unauthenticated attackers can craft malicious links with script payloads in the lng parameter to execute arbitrary JavaScript in victim browser sessions.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |

## Patch verfügbar (OSV)

- 0d554e939a315e7f7f18fba3ca1132b80c6a1adb (Commit)

## Referenzen

- <https://github.com/Cotonti/Cotonti/issues/1907>
- <https://github.com/Cotonti/Cotonti/pull/1908>
- <https://github.com/Cotonti/Cotonti/blob/1.0.0/message.php>
- <https://github.com/Cotonti/Cotonti>
- <https://www.vulncheck.com/advisories/cotonti-through-1.0.0-reflected-xss-via-message-php-lng-parameter>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-100522) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_