CVE-2026-81578 (GCVE-0-2026-81578)

Vulnerability from cvelistv5 – Published: 2026-08-28 11:39 – Updated: 2026-08-29 03:55
VLAI Previdian
Title
PaperCut MF/NG: Authentication Bypass
Summary
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.
Severity
8.8 (High)
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
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-28 00:00 UTC
CWE
  • CWE-305 - Authentication bypass by primary weakness
Assigner
References
Impacted products
Vendor Product Version CPE status
PaperCut PaperCut MF/NG Affected: 0 , < 24.1.10, 25.0.13, 26.0.5 (semver)
guessed Create a notification for this product.
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: b72252ec-5bac-471f-9f55-10b24d534b53

Vulnerability ID: CVE-2026-81578

Status: Confirmed

Status Updated: 2026-08-27 15:39 UTC

Exploited: Yes

Timestamps
First Seen: 2026-08-27
Asserted: 2026-08-27
Scope
Notes: PaperCut MF/NG: Authentication Bypass | Affected: PaperCut / PaperCut MF/NG | CVSS: 8.8 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title PaperCut MF/NG: Authentication Bypass
Vendor PaperCut
Product PaperCut MF/NG
Added Date 2026-08-27T15:39:00.000Z
Cvss Score 8.8
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-08-28 16:00 UTC | Updated: 2026-08-28 16:00 UTC
Show details on NVD website
To clipboard 

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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.