VulnerabilityPublished 25 Feb 2026

CVE-2026-3171: SourceCodester Patients Waiting Area Queue Management System · Cross-site Scripting

Affects SourceCodester Patients Waiting Area Queue Management SystemSource CVE Database V5

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Public exploit available · CVSS 5.1 Medium.

Data as of 29 Oct 2026, 19:04 UTC

CVSS 4.0 base score

5.1Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 16% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

Base metrics

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: Low
User Interaction: Passive
Vulnerable system confidentiality: None
Vulnerable system integrity: Low
Vulnerable system availability: None
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Threat metrics

Exploit Maturity: POC

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: Low: The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction: Passive: Successful exploitation of this vulnerability requires limited interaction by the targeted user with the vulnerable system and the attacker’s payload. These interactions would be considered involuntary and do not require that the user actively subvert protections built into the vulnerable system.
Vulnerable system confidentiality: None: There is no loss of confidentiality within the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.
Exploit Maturity: POC: Based on threat intelligence sources each of the following must apply: · Proof-of-concept is publicly available · No knowledge of reported attempts to exploit this vulnerability · No knowledge of publicly available solutions used to simplify attempts to exploit the vulnerability

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Feb 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
Public exploit code: GitHub proofs of concept
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
SourceCodesterPatients Waiting Area Queue Management System	Affected =1.0	Fixed in–
Patrick MvumaPatients Waiting Area Queue Management System	Affected =1.0	Fixed in–

AI-suggested

To mitigate CVE-2026-3171, organizations should implement strict input validation and output encoding on all user-supplied data, especially the firstname and lastname parameters in /queue.php. Employing a web application firewall (WAF) with rules to detect and block common XSS payloads can provide an additional layer of defense. Developers should sanitize inputs using secure coding libraries or frameworks that automatically escape HTML special characters. Until an official patch is released by SourceCodester, consider isolating the affected system from public internet access or restricting access to trusted users only. Conduct security awareness training to educate users about the risks of clicking unknown links. Regularly monitor logs for suspicious activities indicative of XSS exploitation attempts. Finally, maintain an incident response plan to quickly address any detected exploitation and protect patient data confidentiality and system integrity.

Description

A flaw has been found in SourceCodester/Patrick Mvuma Patients Waiting Area Queue Management System 1.0. Affected by this vulnerability is an unknown functionality of the file /queue.php. This manipulation of the argument firstname/lastname causes cross site scripting. The attack is possible to be carried out remotely. The exploit has been published and may be used.

Impact

The primary impact of CVE-2026-3171 is on the confidentiality and integrity of user data within the Patients Waiting Area Queue Management System. Successful exploitation could allow attackers to steal session cookies, hijack user accounts, or perform unauthorized actions by injecting malicious scripts. This could lead to unauthorized access to patient information, manipulation of queue data, or phishing attacks targeting staff or patients. While availability is not directly affected, the reputational damage and potential regulatory consequences from data breaches in healthcare environments can be significant. Organizations relying on this system may face compliance issues under data protection laws such as HIPAA or GDPR if patient data is compromised. The remote exploitability without authentication increases the risk, especially if users are tricked into clicking malicious links. Although no widespread exploitation is currently known, the published exploit code lowers the barrier for attackers to attempt attacks, potentially leading to targeted campaigns against healthcare providers using this software.

Summary

CVE-2026-3171 identifies a cross-site scripting vulnerability in the Patients Waiting Area Queue Management System version 1.0 developed by SourceCodester. The vulnerability resides in the /queue.php script, specifically in how it processes the firstname and lastname input parameters. An attacker can craft malicious payloads that, when injected into these parameters, execute arbitrary JavaScript code in the context of the victim's browser. This type of vulnerability is classified as reflected XSS, where the malicious script is embedded in a URL or input field and executed when a user interacts with the affected page. The attack vector is remote and does not require prior authentication, increasing the attack surface. However, user interaction is necessary to trigger the malicious script, such as clicking a crafted link or submitting manipulated form data. The CVSS 4.0 vector indicates low attack complexity and no privileges required, but user interaction is mandatory. The vulnerability impacts confidentiality by potentially stealing session tokens or sensitive data, and integrity by enabling script injection that could alter displayed information or perform unauthorized actions on behalf of the user. Availability impact is minimal. No patches or official fixes have been linked yet, and no active exploitation has been reported, but the existence of published exploits raises the risk of future attacks. This vulnerability is particularly concerning in healthcare settings where patient data privacy and system trustworthiness are critical.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 25 Feb 2026, 09:10 UTC

Public exploits and detectionGitHub proofs of concept

Technical details

References

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