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The Single Sign-On Portal System developed by WellChoose contains an OS Command Injection vulnerability, identified as CVE-2026-1428 and classified under CWE-78 . This flaw allows an authenticated remote attacker to execute arbitrary operating system commands on the underlying server . The vulnerability stems from the application’s failure to properly neutralize special elements within user-supplied input before incorporating it into system-level commands . Specifically, input fields processed by server-side functions do not sanitize or escape shell metacharacters such as semicolons (;), pipes (|), or command substitution sequences . An attacker with valid credentials can inject these malicious characters to break out of the intended command context, appending their own payloads . The server then executes these injected commands with the privileges of the web application process, leading to full system compromise . The vulnerability impacts all versions of the WellChoose Single Sign-On Portal System prior to the patched version IFTOP_P4_181 . According to the CVSS v3.1 score, this vulnerability has a base severity of 8.8 (High), with a vector string of AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, indicating a network attack vector with low complexity and high impact on confidentiality, integrity, and availability .
Platform: WellChoose SSO Portal
Version: before IFTOP_P4_181
Vulnerability :OS Command Injection
Severity: HIGH (8.8 CVSS)
date: 2026-01-26
Prediction: Patch already released (IFTOP_P4_181)
What Undercode Say:
Analytics:
This vulnerability is highly critical due to its high CVSS score and the potential for total server takeover. The requirement for authentication does lower the immediate attack surface but significantly increases the risk once an attacker gains any level of access, allowing for privilege escalation and lateral movement within a network .
Bash Commands/Codes:
Example of a command injection payload that could be submitted in a vulnerable form field.
Attempts to list the /etc/passwd file and then continue the original command.
; cat /etc/passwd
Example WAF rule (ModSecurity) to block common command injection patterns
SecRule ARGS "@rx [;|<code>$()&]" \
"id:1001,\
phase:2,\
deny,\
status:403,\
msg:'Potential OS Command Injection Attempt',\
logdata:'%{MATCHED_VAR}'"
Example of using curl to test for the vulnerability (replace target_url and session cookie)
curl -X POST -d "username=admin&password=;id%" -b "session=valid_cookie" https://target-ssoportal.com/login
<h2 style=”color: blue;”>How Exploit:</h2>
An attacker first authenticates to the SSO portal. They then identify input fields (e.g., search boxes, profile updates) that are likely processed by backend system commands. By injecting shell metacharacters like;,|`, or `$(command)` into these fields, they can append their own malicious OS commands. The server, failing to sanitize the input, executes the injected commands, granting the attacker control .
Protection from this CVE:
The primary and most effective protection is to update the WellChoose Single Sign-On Portal System to version IFTOP_P4_181 or later . As an immediate workaround, organizations should implement strict input validation to reject any user input containing shell metacharacters. Deploying a Web Application Firewall (WAF) with rules to detect and block command injection attempts can also provide a virtual patch .
Impact:
Successful exploitation allows an authenticated attacker to execute arbitrary commands on the server. This can lead to the complete compromise of the server’s confidentiality, integrity, and availability. Attackers can exfiltrate sensitive data, install backdoors, use the server to pivot to other internal systems, and disrupt services .
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Sources:
Reported By: nvd.nist.gov
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