Quick answers
- Is CVE-2026-82078 exploited in the wild?
- Yes. CVE-2026-82078 is known to be exploited in the wild, first recorded on 31 August 2026. Treat it as urgent.
- How severe is CVE-2026-82078?
- Critical severity, with a CVSS score of 9.1, published 28 August 2026.
- Which products and versions are affected?
- PaperCut PaperCut NG/MF.
- Is there a fix for CVE-2026-82078?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-82078 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-82078?
- Check whether you run PaperCut Mf, PaperCut Ng, Papercut Mf or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
This vulnerability exploits unsafe Java reflection mechanisms within PaperCut NG/MF that allow attackers to access and manipulate system configuration parameters without proper validation. The flaw enables execution of arbitrary Java bytecode that is already present on the application classpath, running under the security context of the PaperCut server process. The vulnerability can be chained with CVE-2026-81578 for compound impact. An attacker can manipulate application behavior and achieve remote code execution by leveraging Java's reflection APIs to invoke arbitrary methods or instantiate malicious classes. No patch status is specified in the advisory details provided.
Affected products
- PaperCut PaperCut NG/MF
Timeline
- 2026-08-31: disclosed
- exploited: Reported exploited in the wild