CVE-2026-6180
A race condition exists in PaperCut MF when processing badge-swipe data from certain HP multifunction devices.
Impact
A race condition exists in PaperCut MF when processing badge-swipe data from certain HP multifunction devices. Under specific network conditions involving dropped packets and out-of-order sequence counters, the server may incorrectly process fragmented data chunks. If a sequence reset notification fails to reach the server, the server may reject the initial data chunk while erroneously accepting subsequent chunks before a connection reset completes. This leads to the registration of a truncated badge ID string. While this typically results in an authentication failure, the vulnerability is compounded in environments utilizing custom badge-ID post-processing scripts. In such configurations, the truncated string may be transformed into a valid ID belonging to a different user, leading to unauthorized session establishment (Incorrect User Login) on the device.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Papercut | Papercut Mf | before 24.1.9 from 25.0.2 before 25.0.10 |
| Papercut | Papercut Ng | before 24.1.9 from 25.0.2 before 25.0.10 |