---
cve: "CVE-2026-100822"
severity: "MEDIUM"
cvss: 5.4
epss: "0.2%"
vendor: "Generic Security"
kev: false
exploited: false
published: "2026-09-29 13:17:47"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-10-24T03:09:03+02:00"
---

# CVE-2026-100822

> 5.4 MEDIUM

## Beschreibung

Spoofing issue in the Networking: HTTP component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.

## CNA-Record (Kanon, cvelistV5)

- CNA: **mozilla**
- State: PUBLISHED
- Stand: 2026-09-30 20:11:10

## CISA-Anreicherung (vulnrichment/ADP)

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

## CVSS-Vektor

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

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

## Schwachstellen-Klasse

- **CWE-451** — User Interface (UI) Misrepresentation of Critical Information
  The user interface (UI) does not properly represent critical information to the user, allowing the information - or its source - to be obscured or spoofed. This is often a component in phishing attacks.

## Angriffsmuster (CAPEC)

- [CAPEC-98 — Phishing](https://capec.mitre.org/data/definitions/98.html) _(Severity: Very High)_
- [CAPEC-154 — Resource Location Spoofing](https://capec.mitre.org/data/definitions/154.html) _(Severity: Medium)_
- [CAPEC-163 — Spear Phishing](https://capec.mitre.org/data/definitions/163.html) _(Severity: High)_
- [CAPEC-164 — Mobile Phishing](https://capec.mitre.org/data/definitions/164.html) _(Severity: High)_
- [CAPEC-173 — Action Spoofing](https://capec.mitre.org/data/definitions/173.html) _(Severity: Very High)_

## ATT&CK-Techniken

- [T1566 — Phishing](https://attack.mitre.org/techniques/T1566/)
- [T1598 — Phishing for Information](https://attack.mitre.org/techniques/T1598/)
- [T1534 — Internal Spearfishing](https://attack.mitre.org/techniques/T1534/)
- [T1566.001 — Phishing: Spearfishing Attachment](https://attack.mitre.org/techniques/T1566/001/)
- [T1566.002 — Phishing: Spearfishing Link](https://attack.mitre.org/techniques/T1566/002/)
- [T1566.003 — Phishing: Spearfishing via Service](https://attack.mitre.org/techniques/T1566/003/)

## BSI-Hinweise (deutsch)

- [Mozilla Firefox, Firefox ESR und Thunderbird: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-3654) — _BSI-Einstufung: hoch_
  Ein Angreifer kann mehrere Schwachstellen in Mozilla Firefox ESR und Mozilla Firefox ausnutzen, um beliebigen Programmcode auszuführen, Berechtigungen zu erweitern, Sicherheitsmaßnahmen zu umgehen, Daten offenzulegen oder zu manipulieren, einen Denial-of-Service-Zustand auszulösen oder andere, nicht näher spezifizierte Angriffe zu starten.

## Referenzen

- <https://bugzilla.mozilla.org/show_bug.cgi?id=2051115>
- <https://www.mozilla.org/security/advisories/mfsa2026-100/>
- <https://www.mozilla.org/security/advisories/mfsa2026-101/>
- <https://www.mozilla.org/security/advisories/mfsa2026-103/>
- <https://www.mozilla.org/security/advisories/mfsa2026-97/>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-100822/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_