---
cve: "CVE-2026-81578"
severity: "HIGH"
cvss: 8.8
epss: "85.6%"
vendor: "PaperCut"
kev: true
exploited: true
published: "2026-08-28 16:18:29"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-10-24T01:41:51+02:00"
---

# CVE-2026-81578

> 8.8 HIGH · ⚠️ CISA KEV (51 Tage) · 🔓 Exploited

## Beschreibung

An improper access control vulnerability exists in the web management interface of PaperCut MF and PaperCut NG. Under specific conditions, unauthenticated remote requests targeting administrative functions can trigger backend actions prior to the  completion of access validation checks. This allows an unauthenticated remote attacker to modify certain system configurations.

## CNA-Record (Kanon, cvelistV5)

- CNA: **PaperCut**
- State: PUBLISHED
- Stand: 2026-09-13 23:15:33
- CNA-CVSS: **8.8** (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA KEV seit: **28.08.2026**
- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **active**
  - Automatable: **yes**
  - Technical Impact: **partial**

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Schwachstellen-Klasse

- **CWE-305** — Authentication Bypass by Primary Weakness
  The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.

## Referenzen

- <https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/>
- <https://github.com/rapid7/metasploit-framework/pull/21842>
- <https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-81578>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-81578/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_