What’s Vulnerable › Vulnerabilities
CVE-2026-6180: PaperCut MF: Card truncation on HP readers
- Severity: high (CVSS 8.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-05 · updated 2026-10-26
- Weakness: CWE-20
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.
Affected products
- PaperCut MF: before 24.1.9; from 25.0.2 before 25.0.10 — fixed in 24.1.9, 25.0.10
- PaperCut NG: before 24.1.9; from 25.0.2 before 25.0.10 — fixed in 24.1.9, 25.0.10
How to fix
Upgrade to a fixed version: PaperCut MF 24.1.9, 25.0.10; PaperCut NG 24.1.9, 25.0.10. Check the vendor advisory for mitigations.
References
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