CVE-2026-8793Network attack vector

Account compromise via unrestricted MFD login attempts

Published Aug 3, 2026 · Updated Aug 3, 2026

Improper authentication throttling in PaperCut NG/MF before 26.0.3 allows remote attackers to brute-force existing user passwords. The MFD login path accepts rapid repeated failures without account lockout or rate limiting in some configurations. Network access to an affected MFD login endpoint is required; a successful guess compromises only the targeted existing account.

CVSS severity6.9
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication throttling in PaperCut NG/MF before 26.0.3 allows remote attackers to brute-force existing user passwords. The MFD login path accepts rapid repeated failures without account lockout or rate limiting in some configurations. Network access to an affected MFD login endpoint is required; a successful guess compromises only the targeted existing account.

The record

CVE
CVE-2026-8793
Published
Aug 3, 2026
Updated
Aug 3, 2026
Vendor
PaperCut
Product
PaperCut NG/MF
Classifications
CWE-307, T1110
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <26.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PaperCut · PaperCut NG/MFversion=0 <26.0.3

Published CVSS scores

6.9PaperCutCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-307Improper Restriction of Excessive Authentication Attempts
T1110Brute Force

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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