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Back to active CVEs
High · CVSS 9.8Known ExploitedCVE-2026-81578

PaperCut MF/NG: Authentication BypassCVE-2026-81578

Answer in brief

CVE-2026-81578 records a High severity (CVSS 9.8) vulnerability in PaperCut MF/NG: Authentication Bypass. The current sources mark it as known exploited. The current feed maps PaperCut/PaperCut MF/NG (generic), 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 Sep 14, 2026Source checked Oct 12, 2026First seen by HOL Aug 28, 2026Material review Sep 14, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 9.8
Exploitation
Known exploited
Affected software
4 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 9.8. Known-exploitation status makes exposure review time-sensitive. 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), PaperCut/PaperCut MF/NG (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
PaperCut/PaperCut MF/NGgeneric>=0 <24.1.10 25.0.13 26.0.524.1.10, 25.0.13, 26.0.5, 24.1.10
PaperCut/PaperCut MF/NGgeneric>=0 <24.1.10 || >=25.0.0 <25.0.13 || >=26.0.0 <26.0.524.1.10, 25.0.13, 26.0.5

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for PaperCut/PaperCut MF/NG, PaperCut/PaperCut MF/NG.
  2. 2Review the reported fix. Update PaperCut/PaperCut MF/NG to 24.1.10, 25.0.13, 26.0.5; PaperCut/PaperCut MF/NG to 24.1.10 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Aug 28, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 14, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 28, 2026

  4. Added to CISA KEV

    Aug 31, 2026

    Evidence: source:kev:kev:kev:record

Sources and claim methodology

  • GitHub security advisorygithub.com
  • CISA Known Exploited Vulnerabilities catalogcisa.gov
  • 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.

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Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-305
Source
CVE List V5
Source checked
Oct 12, 2026
References
3 linked sources
Open source record