Overview
CVE-2026-81578 has been added to the CISA Known Exploited Vulnerabilities catalog. Published on August 28, 2026. Threat actors are actively exploiting this vulnerability in real-world attacks.
An improper access control vulnerability exists in the web management interface of PaperCut MF and PaperCut NG.
Threat Intelligence
| Metric | Value |
|---|---|
| CVE ID | CVE-2026-81578 |
| Severity | HIGH |
| CVSS Score | 0.0/10 |
| CISA KEV | ✅ Yes — Actively Exploited |
| KEV Date Added | August 31, 2026 |
| Remediation Deadline | September 14, 2026 |
| EPSS Score | 0.4% exploit probability |
| EPSS Percentile | Top 100% of all CVEs |
Why This Matters
This vulnerability has been added to the CISA Known Exploited Vulnerabilities (KEV) catalog, which means threat actors are actively exploiting it in real-world attacks.
Federal agencies are required to remediate by September 14, 2026. All organizations should treat this deadline as a strong recommendation.
CISA Notes: https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-81578
Recommended Actions
- Verify exposure — Determine if your environment uses the affected software.
- Apply patches — Update to the latest version as soon as a fix is available.
- Monitor for compromise — Check logs for unusual activity.
- Meet the deadline — CISA recommends remediation by September 14, 2026.
References
CVE data aggregated from the National Vulnerability Database (NVD), CISA Known Exploited Vulnerabilities catalog, and FIRST EPSS. Analysis updated as new intelligence becomes available. Last updated: 2026-08-31.