CVE-2026-81578
PaperCut MF/NG: Authentication Bypass
Description
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.
INFO
Published Date :
Aug. 28, 2026, 4:18 p.m.
Last Modified :
Aug. 28, 2026, 4:18 p.m.
Remotely Exploit :
Yes !
Source :
eb41dac7-0af8-4f84-9f6d-0272772514f4
Affected Products
The following products are affected by CVE-2026-81578
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | HIGH | eb41dac7-0af8-4f84-9f6d-0272772514f4 | ||||
| CVSS 4.0 | HIGH | eb41dac7-0af8-4f84-9f6d-0272772514f4 |
Solution
- Apply PaperCut MF and NG security updates.
- Restrict access to the management interface.
- Monitor administrative function access.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-81578.
| URL | Resource |
|---|---|
| https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/ |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-81578 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-81578
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-81578 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-81578 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by eb41dac7-0af8-4f84-9f6d-0272772514f4
Aug. 28, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V4.0 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 Added CWE CWE-305 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/81xxx/CVE-2026-81578.json">CVE-2026-81578</a> Added Reference https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/