CVE-2026-81578

8.8 HIGH 85% exploit odds exploited in the wild Fix listed Auth & access Web app

What it is

An improper access control vulnerability exists in the web management interface of PaperCut MF and PaperCut NG. Under specific conditions, unauthenticated remote requests targeting administrative functions can trigger backend actions prior to the completion of access validation checks. This allows an unauthenticated remote attacker to modify certain system configurations.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data tampering.
In the wild: CISA lists this as exploited in real attacks. Treat as urgent.
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-08-27 07:34 UTC ReservedThe CVE id was reserved by its CNA
2026-08-28 16:18 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-08-31 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
2026-09-14 Remediation deadlineCISA's due date for federal agencies to fix it
2026-09-14 00:16 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
Exploit odds: 84.7% in the next 30 days (EPSS).
Severity: 8.8 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2026-08-28 16:18 UTC
Last modified: 2026-09-14 00:16 UTC
Added to CISA KEV: 2026-08-31
Exploit probability: 84.7% · EPSS, next 30 days
Weakness: CWE-305
Record status: Analyzed

Affected

Papercut Mf < 24.1.9
Papercut Mf < 25.0.12
Papercut Mf < 26.0.4
Papercut Ng < 24.1.9
Papercut Ng < 25.0.12
Papercut Ng < 26.0.4

Attack profile CVSS 4.0 · 8.8

Attack vector: Network
Complexity: Low
Attack requirements: None
Privileges needed: None
User interaction: None
Confidentiality: Low
Integrity: High
Availability: Low

Raw vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Is it in your code?

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Read https://cve-list.com/agent/cve/CVE-2026-81578.md and follow it. Check whether this project is affected by CVE-2026-81578. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record