CVE-2026-81578
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.
Actively exploited
- In the CISA exploited-vulnerabilities catalogue since Aug 31, 2026
- US federal agencies must remediate it by Sep 14, 2026 (BOD 22-01)
- Attacked 1 day before the vulnerability was made public
- Confirmed by sensors, not only by reports
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Source: CISA KEV · Oct 15, 2026 Oct 13, 2026 Sep 28, 2026 Sep 9, 2026 Sep 9, 2026 Sep 9, 2026
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HAffected products
| Vendors | Product | Versions |
|---|---|---|
| papercut | papercut mf | < 24.1.9 |
| papercut | papercut ng | < 24.1.9 |
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This product uses the NVD API but is not endorsed or certified by the NVD.