Vulnerability details
CVE-2026-81578
Actively exploited
PaperCut MF/NG
PaperCut MF/NG: Authentication Bypass
CVSS 4.0
8.8High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.8High | 4.0 | CVEProject cvelistV5 (CNA) (PaperCut) | 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 |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| PaperCut | PaperCut MF/NG | v < 24.1.10 | CVEProject cvelistV5 (CNA) |
| PaperCut | PaperCut MF/NG | 25.0.0 ≤ v < 25.0.13 | CVEProject cvelistV5 (CNA) |
| PaperCut | PaperCut MF/NG | 26.0.0 ≤ v < 26.0.5 | CVEProject cvelistV5 (CNA) |
References and advisories
3
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Details
- Published
- 2026-08-28
- Last updated
- 2026-09-14
- State
- Published
- Assigner (CNA)
- PaperCut
- Kolun priority
- 88 · Critical
CISA KEV catalog
- Date added
- 2026-08-31
- Due date
- 2026-09-14
- Used in ransomware
- Unknown
Exploit prediction (EPSS)
84.73%
Probability of exploitation in 30 days
99.7%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Active
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-305Authentication bypass by primary weakness