---
cve: "CVE-2026-93869"
severity: "MEDIUM"
cvss: 5.3
epss: "0.4%"
vendor: "Cotonti"
kev: false
exploited: false
published: "2026-09-18 20:17:34"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-27T04:01:44+02:00"
---

# CVE-2026-93869

> 5.3 MEDIUM · 🧪 PoC

## Beschreibung

Cotonti through 1.0.0 contains an open redirect vulnerability in the cot_url_check() function that validates redirect destinations using a regular expression lacking an end-of-string anchor. Attackers can bypass the redirect guard by supplying hostnames beginning with the site domain to redirect users to attacker-controlled hosts through the ratings plugin or other redirect callers.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/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/1891>
- <https://github.com/Cotonti/Cotonti/pull/1899>
- <https://github.com/Cotonti/Cotonti/blob/1.0.0/system/functions.php>
- <https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/ratings/ratings.ajax.php>
- <https://github.com/Cotonti/Cotonti>
- <https://www.vulncheck.com/advisories/cotonti-through-1.0.0-open-redirect-via-unanchored-cot-url-check-regex>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-93869) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_