CVE-2026-3993VulnerabilityPublished 12 Mar 2026

CVE-2026-3993: itsourcecode Payroll Management System · Cross Site Scripting

Affects itsourcecode Payroll Management SystemSource CVE Database V5

Not known to be exploited · CVSS 5.3 Medium.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 4.0 base score

5.3Medium

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

EPSS: 0.2% chance of exploitation in 30 days – higher than 19% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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: None
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: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
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 12 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
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), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC 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
itsourcecodePayroll Management System	Affected =1.0	Fixed in–

CPE configurations (1)

cpe:2.3:a:itsourcecode:payroll_management_system:*:*:*:*:*:*:*:*

AI-suggested

Given the absence of an official patch, organizations should implement immediate mitigations including: 1) Applying strict input validation on the 'ID' parameter to allow only expected numeric or alphanumeric values, rejecting any input containing script or HTML tags. 2) Employing output encoding or escaping techniques to neutralize any injected scripts before rendering data in the browser. 3) Implementing Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts. 4) Educating users to recognize and avoid suspicious links or emails that could trigger XSS attacks. 5) Monitoring web server logs and application behavior for unusual requests or error patterns indicative of exploitation attempts. 6) If possible, isolating the payroll management system behind a VPN or internal network to reduce exposure. 7) Planning for an upgrade or patch deployment as soon as the vendor releases a fix. 8) Conducting regular security assessments and penetration testing focused on input validation and XSS vulnerabilities.

Description

A security vulnerability has been detected in itsourcecode Payroll Management System 1.0. This vulnerability affects unknown code of the file /manage_employee_deductions.php. Such manipulation of the argument ID leads to cross site scripting. The attack may be launched remotely. The exploit has been disclosed publicly and may be used.

Impact

The primary impact of CVE-2026-3993 is the compromise of user confidentiality and integrity through the execution of arbitrary scripts in the context of authenticated users. Attackers can steal session tokens, enabling account takeover, or perform actions on behalf of users, potentially manipulating payroll data or accessing sensitive employee information. This can lead to financial fraud, data breaches, and reputational damage for organizations. Since the vulnerability is remotely exploitable without authentication, it broadens the attack surface significantly. The requirement for user interaction limits automated exploitation but does not eliminate risk, especially in environments where phishing or social engineering is common. Organizations relying on the affected payroll system may face regulatory compliance issues if sensitive employee data is exposed. The medium severity rating reflects moderate impact and ease of exploitation, but the critical nature of payroll data elevates the importance of timely remediation.

Summary

CVE-2026-3993 identifies a cross-site scripting vulnerability in the itsourcecode Payroll Management System version 1.0. The vulnerability exists in the /manage_employee_deductions.php file due to insufficient input validation of the 'ID' parameter. An attacker can craft a malicious URL or input that injects executable JavaScript code, which is then reflected back to the user without proper sanitization. This reflected XSS can be exploited remotely without requiring any authentication, making it accessible to unauthenticated attackers. The attack requires user interaction, such as clicking a malicious link or visiting a crafted webpage, to execute the injected script in the victim’s browser context. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:P), and limited impact on confidentiality and integrity (VI:L, VC:N). The vulnerability does not affect availability or require scope changes. While no known exploits are currently active in the wild, the public disclosure increases the likelihood of exploitation attempts. The impact of this vulnerability includes potential theft of session cookies, redirection to malicious sites, or execution of unauthorized actions on behalf of the victim user, potentially compromising sensitive payroll data or user accounts. The lack of patches or official fixes necessitates immediate mitigation through input validation and output encoding at the application level.

References

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