# CVE-2026-87739: PaperCut MF/NG authentication bypass in report generation

Source: https://junglewise.ai/threats/cve-2026-87739-an-improper-authentication-vulnerability-in-papercut-mf-ng-allows  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-24. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-87739 · Severity: info · Published 2026-09-24

PaperCut MF and NG are print management servers that control printing across organizations. An unauthenticated attacker can remotely trigger report generation without valid credentials, potentially exposing sensitive information contained in those reports such as print logs and usage data.

Technologies: [PaperCut Mf](https://junglewise.ai/threats/technologies/mf), [PaperCut Ng](https://junglewise.ai/threats/technologies/ng). Vendors: [PaperCut](https://junglewise.ai/threats/vendors/papercut).

## Quick answers

**Is CVE-2026-87739 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-87739 being exploited in the wild.

**How severe is CVE-2026-87739?** Informational severity, published 24 September 2026.

**Which products and versions are affected?** PaperCut MF; PaperCut NG.

**Is there a fix for CVE-2026-87739?** 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-2026-87739 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-87739?** Check whether you run PaperCut Mf or PaperCut Ng. 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

An improper authentication vulnerability allows unauthenticated remote access to the report generation functionality in PaperCut MF/NG. The vulnerability requires network access to the management interface but no valid credentials; attackers can submit crafted report generation requests to retrieve sensitive data. A patch is available from PaperCut.

## Affected products

- PaperCut MF
- PaperCut NG

## Timeline

- 2026-09-24: disclosed

## References

- [https://www.papercut.com/kb/Main/security-bulletin-sep-2026/](https://www.papercut.com/kb/Main/security-bulletin-sep-2026/)

## Related threats

- [PaperCut NG/MF path traversal in Scan-to-Fax component](https://junglewise.ai/threats/cve-2026-82077-an-improper-limitation-of-a-pathname-to-a-restricted-directory)
- [PaperCut NG/MF sandbox escape in device scripting](https://junglewise.ai/threats/cve-2026-14780-a-vulnerability-exists-in-the-papercut-ng-mf-platform-s-device)
- [PaperCut NG/MF unsafe reflection vulnerability](https://junglewise.ai/threats/cve-2026-82078-papercut-ng-mf-unsafe-reflection-vulnerability)
- [PaperCut NG/MF missing authentication for critical function](https://junglewise.ai/threats/cve-2026-81578-papercut-ng-mf-missing-authentication-for-critical-function)
- [PaperCut NG/MF authentication bypass in SecurityRequestFilter](https://junglewise.ai/threats/cve-2023-27351-papercut-ng-mf-authentication-bypass-in-securityrequestfilter)