CVE-2026-6180
Description
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.
How to fix
- papercut papercut_mf24.1.9, 25.0.10 or later
- papercut papercut_ng24.1.9, 25.0.10 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| papercut papercut_mf | v < 24.1.9, 25.0.2 ≤ v < 25.0.10 | 24.1.9, 25.0.10 |
| papercut papercut_ng | v < 24.1.9, 25.0.2 ≤ v < 25.0.10 | 24.1.9, 25.0.10 |
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