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Exploited vulnerability · CISA KEV

Is CVE-2026-82078 exploited? Yes: in CISA KEV since 31 Aug 2026

Gociux · PaperCut NG/MF · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-82078, PaperCut NG/MF Unsafe Reflection Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 31 Aug 2026, 3 days after it was published. It affects PaperCut NG/MF. If you run it, CISA's required action is: 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.

exploitedYesCISA KEV · 31 Aug 2026
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.4CVSS 4.0 · critical
US federal due14 Sep 2026BOD 22-01 deadline

What it is

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.

VendorPaperCut (5 exploited CVEs in KEV)
ProductNG/MF
VulnerabilityPaperCut NG/MF Unsafe Reflection Vulnerability
WeaknessCWE-470
Published28 Aug 2026
Added to KEV31 Aug 2026
Reported by (CNA)PaperCut

What to do

  1. Check whether you run it. Look for NG/MF in your asset inventory, including appliances and cloud images. Stack check lists every exploited PaperCut CVE at once.
  2. Apply the fix. 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.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 28 Aug 2026.
  4. Get told next time. Email alerts when CISA adds a CVE for PaperCut.

Other exploited CVEs in NG/MF

References

Questions

Is CVE-2026-82078 being exploited?

Yes. CISA added CVE-2026-82078 to the Known Exploited Vulnerabilities catalog on 31 Aug 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2026-82078 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2026-82078?

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. Check PaperCut's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected NG/MF and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in August 2026 · PaperCut scorecard · act-now radar.

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