A vulnerability was found in FOSSBilling 0.5.0/0.5.1/0.5.3/0.5.4/0.5.5. It has been rated as problematic. The impacted element is an unknown function of the component Guest API. This manipulation of the argument gateway_id causes improper authorization.
This vulnerability is tracked as CVE-2026-42331. The attack is possible to be carried out remotely. No exploit exists.
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CVE-2026-42331 | FOSSBilling up to 0.5.5 Guest API gateway_id improper authorization (EUVD-2026-41947)
A vulnerability was found in FOSSBilling 0.5.0/0.5.1/0.5.3/0.5.4/0.5.5. It has been rated as problematic. The impacted element is an unknown function of the component Guest API. This manipulation of the argument gateway_id causes improper…
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IoC Intelligence (1 Indikatoren)
CVE-2026-42331
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title: Detect Exploitation - CVE-2026-42331 | FOSSBilling up to 0.5.5 Guest API gateway_id improper authorization (EUVD-2026-41947)
id: 2c8648e0-33a7-4c5d-9308-1feda3671475
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
- https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-24
logsource:
category: network_connection
product: any
detection:
selection:
CommandLine|contains:
- 'exploit'
condition: selection
falsepositives:
- Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
- attack.initial_accessrule CTI_Threat_Indicator {
meta:
author = "iShareStuff CTI Automated Detection Engine"
date = "2026-09-24"
description = "YARA Signature for "
strings:
$str = "CVE-2026-42331 | FOSSBilling u" ascii wide
condition:
any of them
}INFRASTRUCTURE BLAST RADIUS & EXPOSURE
Live-Vektor: NETWORK
LOCALIZED
Perimeter & Ingress
GEFÄHRDET (75%)
Lateral Pivot & AD
Geringes Risiko
Crown Jewels & DB
Geringes Risiko
Supply Chain Reach
Geringes Risiko
tsecurity.de Cognitive Threat RAG
Fokus-Vektor:
Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich CVE-2026-42331 | FOSSBilling up to 0.5.5.... Basierend auf 368k Vektor-Korrelationen werden sofortige Isolationsmaßnahmen für betroffene Endpunkte empfohlen.
🛡️ Angriffsfläche & Exposure
Netzwerk/Remote-Zugriff ohne Vorauthentifizierung möglich.
⚡ Empfohlene Sofortmaßnahmen
- 1. Perimeter-Inspektion: Relevante Portfreigaben und exponierte Endpunkte unverzüglich scannen.
- 2. Patch-Applikation: Hersteller-Hotfix einspielen oder betroffene Daemons in isolierte DMZ-Segmente überführen.
- 3. Telemetrie & EDR-Alerts: Prozessaufrufe und Child-Processes auf anomale Shell-Spawns überwachen.
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