CVE-2026-81578 (GCVE-0-2026-81578)
Vulnerability from cvelistv5 – Published: 2026-08-28 11:39 – Updated: 2026-09-13 23:15Title
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
SSVC
Exploitation: active
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
3 references
| URL | Tags |
|---|---|
| https://www.papercut.com/kb/Main/security-bulleti… | |
| https://github.com/rapid7/metasploit-framework/pu… | exploit |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| PaperCut | PaperCut MF/NG |
Affected:
0 , < 24.1.10
(semver)
Affected: 25.0.0 , < 25.0.13 (semver) Affected: 26.0.0 , < 26.0.5 (semver) |
guessed |
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: f0c2d6c9-3315-46e7-b7f0-478e2eea4b90
Exploited: Yes
Timestamps
First Seen: 2026-08-31
Asserted: 2026-08-31
Scope
Notes: PaperCut NG/MF Missing Authentication for Critical Function Vulnerability | Affected: PaperCut / NG/MF | Description: PaperCut NG/MF contains a missing authentication for critical function vulnerability which allows an unauthenticated remote attacker to modify certain system configurations. This vulnerability can be chained with CVE-2026-82078. | Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. | Due date: 2026-09-14 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-81578
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-306 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | NG/MF |
| Due Date | 2026-09-14 |
| Date Added | 2026-08-31 |
| Vendorproject | PaperCut |
| Vulnerabilityname | PaperCut NG/MF Missing Authentication for Critical Function Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-08-31 16:00 UTC
| Updated: 2026-08-31 16:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: b72252ec-5bac-471f-9f55-10b24d534b53
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
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"orgId": "eb41dac7-0af8-4f84-9f6d-0272772514f4",
"shortName": "PaperCut"
},
"references": [
{
"url": "https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "PaperCut MF/NG: Authentication Bypass",
"x_generator": {
"engine": "Vulnogram 1.0.5"
}
}
},
"cveMetadata": {
"assignerOrgId": "eb41dac7-0af8-4f84-9f6d-0272772514f4",
"assignerShortName": "PaperCut",
"cveId": "CVE-2026-81578",
"datePublished": "2026-08-28T11:39:45.402Z",
"dateReserved": "2026-08-27T07:34:07.363Z",
"dateUpdated": "2026-09-13T23:15:33.997Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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