---
cve: "CVE-2026-16358"
severity: "CRITICAL"
cvss: 9.8
epss: "22%"
vendor: "Generic Security"
kev: false
exploited: false
published: "2026-07-21 13:17:04"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-09T13:31:03+02:00"
---

# CVE-2026-16358

> 9.8 CRITICAL

## Beschreibung

Site isolation issue in the Graphics: WebRender component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

## CVSS-Vektor

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

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

## Referenzen

- <https://bugzilla.mozilla.org/show_bug.cgi?id=2040119>
- <https://www.mozilla.org/security/advisories/mfsa2026-68/>
- <https://www.mozilla.org/security/advisories/mfsa2026-69/>
- <https://www.mozilla.org/security/advisories/mfsa2026-70/>
- <https://www.mozilla.org/security/advisories/mfsa2026-71/>
- <https://www.mozilla.org/security/advisories/mfsa2026-72/>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-16358) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_