---
cve: "CVE-2026-18918"
severity: "CRITICAL"
cvss: 9.1
epss: "0.4%"
vendor: "Eclipse Foundation"
kev: false
exploited: false
published: "2026-08-28 12:16:27"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T09:23:12+02:00"
---

# CVE-2026-18918

> 9.1 CRITICAL · 🧪 PoC

## Beschreibung

In Eclipse Lyo versions 2.0.0 to 7.0.0, OAuth server authorization checks can be bypassed when the 2-legged auth is supported by the server. In those cases, application that based their authz filters upon Lyo-provided `AbstractAdapterCredentialsFilter`, are vulnerable. An attacked can create a provisional trusted client (valid use-case) but then it can be used as a trusted client immediately without requiring the administrator approval to clear the provisional status. The 3-legged path requiring user interaction is not vulnerable and rejects provisional clients.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/AU:Y/R:U/V:C/RE:L/U:Red
```

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

## Patch verfügbar (OSV)

- b2aea6146e62e1f292aff2b5ab65086e9c82b1a5 (Commit)

## Referenzen

- <https://github.com/eclipse-lyo/lyo/releases/tag/v6.0.1.Final>
- <https://github.com/eclipse-lyo/lyo/releases/tag/v7.0.0.Beta3>
- <https://gitlab.eclipse.org/security/cve-assignment/-/work_items/221>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-18918) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_