---
cve: "CVE-2026-89058"
severity: "HIGH"
cvss: 7.4
epss: "0.3%"
vendor: "Red Hat"
kev: false
exploited: false
published: "2026-09-18 08:17:01"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T20:06:03+02:00"
---

# CVE-2026-89058

> 7.4 HIGH · 🧪 PoC

## Beschreibung

A flaw was found in RESTEasy's CorsFilter, which, when configured to allow all origins ("*"), reflects the request's Origin header back in the Access-Control-Allow-Origin response together with Access-Control-Allow-Credentials: true. This permissive cross-origin policy allows a malicious website to make credentialed cross-origin requests and read authenticated responses from a victim's session, resulting in a loss of confidentiality.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- efeb2b7 (Commit)

## Referenzen

- <https://access.redhat.com/security/cve/CVE-2026-89058>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2519775>
- <https://github.com/resteasy/resteasy/commit/efeb2b7>
- <https://github.com/resteasy/resteasy/security/advisories/GHSA-972r-f3fv-whm3>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-89058) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_