Affects widely deployed PaperCut NG/MF admin interface, is in CISA KEV and allows unauthenticated config changes that can lead to broader compromise.
CVE-2026-81578
Unauthenticated web-admin flaw in PaperCut NG/MF allows remote config modification.
Is CVE-2026-81578 being exploited?
Yes. CVE-2026-81578 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.
How severe is CVE-2026-81578?
CVE-2026-81578 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-81578?
Yes. A fix has been recorded for CVE-2026-81578. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-81578 affect?
CVE-2026-81578 affects PaperCut NG, PaperCut MF. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-81578?
Apply vendor patch/mitigations immediately; isolate internet-exposed PaperCut servers.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote attacker can modify system configurations via the web admin interface; can be chained to achieve RCE or takeover.
Immediate action required
- affected< 24.1.10, 25.0.13, 26.0.5
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.