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CVE-2026-82078 (GCVE-0-2026-82078)

Vulnerability from cvelistv5 – Published: 2026-08-28 11:45 – Updated: 2026-09-13 23:16
VLAI CISA Previdian
Title
PaperCut MF/NG: Unsafe Dynamic Class Loading in Database Connector
Summary
An unsafe dynamic class loading vulnerability exists in the database connection utilities of PaperCut MF and PaperCut NG. The application instantiates database driver classes based on configurable driver names without validating against an allowlist of approved drivers. If an attacker can manipulate system configuration parameters, this enables the execution of arbitrary Java bytecode residing on the application classpath under the security context of the PaperCut server process.
Severity
9.4 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-28 00:00 UTC
CWE
  • CWE-470 - Use of Externally-Controlled input to select classes or code ('unsafe reflection')
Assigner
References
Impacted products
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 Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 4d27face-c305-4382-a707-631f016fd57b

Vulnerability ID: CVE-2026-82078

Status: Confirmed

Status Updated: 2026-08-31 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-08-31
Asserted: 2026-08-31
Scope
Notes: PaperCut NG/MF Unsafe Reflection Vulnerability | Affected: PaperCut / NG/MF | Description: PaperCut NG/MF contains an unsafe reflection vulnerability that allows an attacker to manipulate system configuration parameters and execute arbitrary Java bytecode residing on the application classpath under the security context of the PaperCut server process. This vulnerability can be chained with CVE-2026-81578. | 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/?lid=2oneu2wt0ct4 ; 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-2026-82078
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-470
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 Unsafe Reflection 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: d259be66-927c-49a1-a093-8d4e86378bc5

Vulnerability ID: CVE-2026-82078

Status: Confirmed

Status Updated: 2026-08-27 20:32 UTC

Exploited: Yes

Timestamps
First Seen: 2026-08-27
Asserted: 2026-08-27
Scope
Notes: PaperCut MF/NG: Unsafe Dynamic Class Loading in Database Connector | Affected: PaperCut / PaperCut MF/NG | CVSS: 9.4 (CRITICAL) | 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: Unsafe Dynamic Class Loading in Database Connector
Vendor PaperCut
Product PaperCut MF/NG
Added Date 2026-08-27T20:32:00.000Z
Cvss Score 9.4
Epss Score None
Cvss Severity CRITICAL
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-08-28 21:00 UTC | Updated: 2026-08-28 21:00 UTC
Show details on NVD website
To clipboard 

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          ],
          "metrics": [
            {
              "cvssV4_0": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
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                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "baseScore": 9.4,
                "baseSeverity": "CRITICAL",
                "exploitMaturity": "NOT_DEFINED",
                "privilegesRequired": "HIGH",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "HIGH",
                "subConfidentialityImpact": "HIGH",
                "subIntegrityImpact": "HIGH",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
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                "vulnConfidentialityImpact": "HIGH",
                "vulnIntegrityImpact": "HIGH",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
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                  "lang": "en",
                  "value": "GENERAL"
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              "descriptions": [
                {
                  "cweId": "CWE-470",
                  "description": "CWE-470 Use of Externally-Controlled input to select classes or code (\u0027unsafe reflection\u0027)",
                  "lang": "en",
                  "type": "CWE"
                }
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          ],
          "providerMetadata": {
            "dateUpdated": "2026-09-13T23:16:32.332Z",
            "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: Unsafe Dynamic Class Loading in Database Connector",
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      "cveMetadata": {
        "assignerOrgId": "eb41dac7-0af8-4f84-9f6d-0272772514f4",
        "assignerShortName": "PaperCut",
        "cveId": "CVE-2026-82078",
        "datePublished": "2026-08-28T11:45:25.388Z",
        "dateReserved": "2026-08-28T00:13:25.684Z",
        "dateUpdated": "2026-09-13T23:16:32.332Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
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    }
  }
}



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Tags
Taxonomy of the tags.





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.


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.