CVE Details
CVE-2026-82078
PaperCut NG/MF Unsafe Reflection Vulnerability
Published: 2026-08-28
CVSS: 9.4 CRITICAL
Product: PaperCut NG/MF
Due Date: 2026-09-11
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.
GitHub PoC
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FIRST EPSS
EPSS estimates the probability of exploitation in the next 30 days. Higher values indicate higher likelihood of real-world exploitation.
Timeline
CVE Stalker
KEV
MITRE
GitHub
FIRST (EPSS)
MITRE
CVSS
SSVC
References
Show Raw Data
| Key | Remaining Key | Value |
|---|---|---|
| dataType | CVE_RECORD | |
| dataVersion | 5.2 | |
| cveMetadata > | cveId | CVE-2026-82078 |
| cveMetadata > | assignerOrgId | eb41dac7-0af8-4f84-9f6d-0272772514f4 |
| cveMetadata > | state | PUBLISHED |
| cveMetadata > | assignerShortName | PaperCut |
| cveMetadata > | dateReserved | 2026-08-28T00:13:25.684Z |
| cveMetadata > | datePublished | 2026-08-28T11:45:25.388Z |
| cveMetadata > | dateUpdated | 2026-08-31T14:58:23.620Z |
| containers > | cna > providerMetadata > orgId | eb41dac7-0af8-4f84-9f6d-0272772514f4 |
| containers > | cna > providerMetadata > shortName | PaperCut |
| containers > | cna > providerMetadata > dateUpdated | 2026-08-28T11:45:25.388Z |
| containers > | cna > title | PaperCut MF/NG: Unsafe Dynamic Class Loading in Database Connector |
| containers > | cna > problemTypes > 0 > descriptions > 0 > lang | en |
| containers > | cna > problemTypes > 0 > descriptions > 0 > cweId | CWE-470 |
| containers > | cna > problemTypes > 0 > descriptions > 0 > description | CWE-470 Use of Externally-Controlled input to select classes or code ('unsafe reflection') |
| containers > | cna > problemTypes > 0 > descriptions > 0 > type | CWE |
| containers > | cna > affected > 0 > vendor | PaperCut |
| containers > | cna > affected > 0 > product | PaperCut MF/NG |
| containers > | cna > affected > 0 > versions > 0 > status | affected |
| containers > | cna > affected > 0 > versions > 0 > version | 0 |
| containers > | cna > affected > 0 > versions > 0 > lessThan | 24.1.10, 25.0.13, 26.0.5 |
| containers > | cna > affected > 0 > versions > 0 > versionType | semver |
| containers > | cna > affected > 0 > defaultStatus | unaffected |
| containers > | cna > descriptions > 0 > lang | en |
| containers > | cna > descriptions > 0 > value | 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. |
| containers > | cna > descriptions > 0 > supportingMedia > 0 > type | text/html |
| containers > | cna > descriptions > 0 > supportingMedia > 0 > base64 | False |
| containers > | cna > descriptions > 0 > supportingMedia > 0 > value | <p>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.</p> |
| containers > | cna > references > 0 > url | https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/ |
| containers > | cna > metrics > 0 > format | CVSS |
| containers > | cna > metrics > 0 > scenarios > 0 > lang | en |
| containers > | cna > metrics > 0 > scenarios > 0 > value | GENERAL |
| containers > | cna > metrics > 0 > cvssV4_0 > attackVector | NETWORK |
| containers > | cna > metrics > 0 > cvssV4_0 > attackComplexity | LOW |
| containers > | cna > metrics > 0 > cvssV4_0 > attackRequirements | NONE |
| containers > | cna > metrics > 0 > cvssV4_0 > privilegesRequired | HIGH |
| containers > | cna > metrics > 0 > cvssV4_0 > userInteraction | NONE |
| containers > | cna > metrics > 0 > cvssV4_0 > vulnConfidentialityImpact | HIGH |
| containers > | cna > metrics > 0 > cvssV4_0 > subConfidentialityImpact | HIGH |
| containers > | cna > metrics > 0 > cvssV4_0 > vulnIntegrityImpact | HIGH |
| containers > | cna > metrics > 0 > cvssV4_0 > subIntegrityImpact | HIGH |
| containers > | cna > metrics > 0 > cvssV4_0 > vulnAvailabilityImpact | HIGH |
| containers > | cna > metrics > 0 > cvssV4_0 > subAvailabilityImpact | HIGH |
| containers > | cna > metrics > 0 > cvssV4_0 > exploitMaturity | NOT_DEFINED |
| containers > | cna > metrics > 0 > cvssV4_0 > Safety | NOT_DEFINED |
| containers > | cna > metrics > 0 > cvssV4_0 > Automatable | NOT_DEFINED |
| containers > | cna > metrics > 0 > cvssV4_0 > Recovery | NOT_DEFINED |
| containers > | cna > metrics > 0 > cvssV4_0 > valueDensity | NOT_DEFINED |
| containers > | cna > metrics > 0 > cvssV4_0 > vulnerabilityResponseEffort | NOT_DEFINED |
| containers > | cna > metrics > 0 > cvssV4_0 > providerUrgency | NOT_DEFINED |
| containers > | cna > metrics > 0 > cvssV4_0 > version | 4.0 |
| containers > | cna > metrics > 0 > cvssV4_0 > baseSeverity | CRITICAL |
| containers > | cna > metrics > 0 > cvssV4_0 > baseScore | 9.4 |
| containers > | cna > metrics > 0 > cvssV4_0 > 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 |
| containers > | cna > source > discovery | UNKNOWN |
| containers > | cna > x_generator > engine | Vulnogram 1.0.5 |
| containers > | adp > 0 > references > 0 > url | https://github.com/rapid7/metasploit-framework/pull/21842 |
| containers > | adp > 0 > references > 0 > tags > 0 | exploit |
| containers > | adp > 0 > references > 1 > name | CISA KEV |
| containers > | adp > 0 > references > 1 > tags > 0 | government-resource |
| containers > | adp > 0 > references > 1 > url | https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-82078 |
| containers > | adp > 0 > metrics > 0 > other > type | ssvc |
| containers > | adp > 0 > metrics > 0 > other > content > timestamp | 2026-08-31T12:33:45.803363Z |
| containers > | adp > 0 > metrics > 0 > other > content > id | CVE-2026-82078 |
| containers > | adp > 0 > metrics > 0 > other > content > options > 0 > Exploitation | poc |
| containers > | adp > 0 > metrics > 0 > other > content > options > 1 > Automatable | no |
| containers > | adp > 0 > metrics > 0 > other > content > options > 2 > Technical Impact | total |
| containers > | adp > 0 > metrics > 0 > other > content > role | CISA Coordinator |
| containers > | adp > 0 > metrics > 0 > other > content > version | 2.0.3 |
| containers > | adp > 0 > metrics > 1 > other > type | kev |
| containers > | adp > 0 > metrics > 1 > other > content > dateAdded | 2026-08-28 |
| containers > | adp > 0 > metrics > 1 > other > content > reference | https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-82078 |
| containers > | adp > 0 > title | CISA ADP Vulnrichment |
| containers > | adp > 0 > providerMetadata > orgId | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
| containers > | adp > 0 > providerMetadata > shortName | CISA-ADP |
| containers > | adp > 0 > providerMetadata > dateUpdated | 2026-08-31T14:58:23.620Z |
| containers > | adp > 0 > timeline > 0 > time | 2026-08-28T00:00:00.000Z |
| containers > | adp > 0 > timeline > 0 > lang | en |
| containers > | adp > 0 > timeline > 0 > value | CVE-2026-82078 added to CISA KEV |