CVE-2026-81578 KEV
9.8
CRITICAL · CVSS 3.1 · EPSS 4.5% (pctl 91)
Patch first
On CISA KEV — known exploited in the wild, due 2026-09-14.
Description
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 4.48% — more likely to be exploited than 91% of all CVEs |
| Weakness | CWE-305 |
| On CISA KEV | yes — remediate by 2026-09-14 |
| Public exploit | none known |
| Published | 2026-08-28 |
| Last modified | 2026-09-14 |
CISA KEV
| Name | PaperCut NG/MF Missing Authentication for Critical Function Vulnerability |
|---|---|
| Added | 2026-08-31 |
| Due | 2026-09-14 |
| Vendor / product | PaperCut / NG/MF |
| Ransomware use | none reported |
Affected (2)
| Vendor | Product |
|---|---|
| papercut | papercut mf |
| papercut | papercut ng |
References
→ the Explorer · watch your stack · NVD