CVE-2023-27350Known exploitationPublic exploitNetwork attack vector

Unauthenticated code execution via automatic administrator login

Published Apr 20, 2023 · Updated Oct 21, 2025

Authentication bypass in PaperCut NG/MF 22.0.5 allows remote attackers to execute arbitrary code on the Application Server. The SetupCompleted form calls Home.performLogin for the Admin user without password validation, converting an anonymous session into an administrative session. Network access to the Application Server is sufficient, and built-in print scripting then executes attacker-supplied commands as SYSTEM or root.

CVSS severity9.8
Critical
EPSS probability100.00%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in PaperCut NG/MF 22.0.5 allows remote attackers to execute arbitrary code on the Application Server. The SetupCompleted form calls Home.performLogin for the Admin user without password validation, converting an anonymous session into an administrative session. Network access to the Application Server is sufficient, and built-in print scripting then executes attacker-supplied commands as SYSTEM or root.

The record

CVE
CVE-2023-27350
Published
Apr 20, 2023
Updated
Oct 21, 2025
Vendor
PaperCut
Product
PaperCut NG/MF
Classifications
CWE-284, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 2023Exploitation reportedCISA Known Exploited Vulnerabilities catalog inclusion
  3. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=22.0.5 (Build 63914)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PaperCut · PaperCut NG/MFversion=22.0.5 (Build 63914)

Published CVSS scores

9.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8PaperCutCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsShadowserver observations through Sep 16, 2026. Gaps indicate unavailable data.
Sep 10, 2026Sep 16, 2026
View daily counts
Reporting dayUnique IPs
Sep 10, 2026Unavailable
Sep 11, 2026Unavailable
Sep 12, 2026Unavailable
Sep 13, 2026Unavailable
Sep 14, 20261
Sep 15, 2026Unavailable
Sep 16, 20261
Latest reporting daySep 16, 2026
Latest daily unique IPs1
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
T1190Exploit Public-Facing Application

Public exploit references

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

Reported exploitation

Technologies

Your stack

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Your stack

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