PaperCut MF/NG: Authentication Bypass

Answer in brief

CVE-2026-81578 records a Unknown severity vulnerability in PaperCut MF/NG: Authentication Bypass. The current sources do not mark it as known exploited. The current feed maps PaperCut/PaperCut MF/NG (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 28, 2026Updated Aug 28, 2026Source checked Aug 28, 2026First seen by HOL Aug 28, 2026Material review Aug 28, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps PaperCut/PaperCut MF/NG (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
PaperCut/PaperCut MF/NGgeneric	>=0 <24.1.10, 25.0.13, 26.0.5	24.1.10, 25.0.13, 26.0.5

Recommended response

Check inventory. Check lockfiles and deployed manifests for PaperCut/PaperCut MF/NG.
Review the reported fix. Update PaperCut/PaperCut MF/NG to 24.1.10, 25.0.13, 26.0.5 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 28, 2026

Sources and claim methodology

Source referencepapercut.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.