---
cve: "CVE-2026-12315"
severity: "CRITICAL"
cvss: 9.1
epss: "0.3%"
vendor: "Generic Security"
kev: false
exploited: false
published: "2026-06-16 13:16:32"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-11-09T20:46:51+01:00"
---

# CVE-2026-12315

> 9.1 CRITICAL

## Beschreibung

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

## CNA-Record (Kanon, cvelistV5)

- CNA: **mozilla**
- State: PUBLISHED
- Stand: 2026-06-16 18:26:13

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **total**

## CVSS-Vektor

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

| 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 | Keine | good |

## Schwachstellen-Klasse

- **CWE-693** — Protection Mechanism Failure
  The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

## Angriffsmuster (CAPEC)

- [CAPEC-1 — Accessing Functionality Not Properly Constrained by ACLs](https://capec.mitre.org/data/definitions/1.html) _(Severity: High)_
- [CAPEC-17 — Using Malicious Files](https://capec.mitre.org/data/definitions/17.html) _(Severity: Very High)_
- [CAPEC-20 — Encryption Brute Forcing](https://capec.mitre.org/data/definitions/20.html) _(Severity: Low)_
- [CAPEC-22 — Exploiting Trust in Client](https://capec.mitre.org/data/definitions/22.html) _(Severity: High)_
- [CAPEC-36 — Using Unpublished Interfaces or Functionality](https://capec.mitre.org/data/definitions/36.html) _(Severity: High)_
- [CAPEC-107 — Cross Site Tracing](https://capec.mitre.org/data/definitions/107.html) _(Severity: Very High)_
- [CAPEC-127 — Directory Indexing](https://capec.mitre.org/data/definitions/127.html) _(Severity: Medium)_
- [CAPEC-237 — Escaping a Sandbox by Calling Code in Another Language](https://capec.mitre.org/data/definitions/237.html) _(Severity: Very High)_

## ATT&CK-Techniken

- [T1574.010 — Hijack Execution Flow: ServicesFile Permissions Weakness](https://attack.mitre.org/techniques/T1574/010/)
- [T1574.005 — Hijack Execution Flow: Executable Installer File Permissions](https://attack.mitre.org/techniques/T1574/005/)
- [T1083 — File and Directory Discovery](https://attack.mitre.org/techniques/T1083/)

## BSI-Hinweise (deutsch)

- [Mozilla Firefox, Firefox ESR und Thunderbird: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-1959) — _BSI-Einstufung: hoch_
  Ein Angreifer kann mehrere Schwachstellen in Mozilla Firefox, Mozilla Firefox ESR und Mozilla Thunderbird ausnutzen, um beliebigen Code auszuführen, erweiterte Berechtigungen zu erlangen, Speicherbeschädigungen zu verursachen, Sicherheitsmaßnahmen zu umgehen und aus der Sandbox auszubrechen, vertrauliche Informationen offenzulegen, Daten zu manipulieren und Denial-of-Service-Zustände auszulösen.

## Referenzen

- <https://bugzilla.mozilla.org/show_bug.cgi?id=2042058>
- <https://www.mozilla.org/security/advisories/mfsa2026-57/>
- <https://www.mozilla.org/security/advisories/mfsa2026-58/>
- <https://www.mozilla.org/security/advisories/mfsa2026-60/>
- <https://www.mozilla.org/security/advisories/mfsa2026-61/>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-12315/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_