VulnerabilityPublished 26 Mar 2026

CVE-2026-4877: itsourcecode Payroll Management System · Cross-site Scripting

Affects itsourcecode Payroll Management SystemSource CVE Database V5

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Public exploit available · CVSS 5.3 Medium.

Data as of 30 Oct 2026, 11:52 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 26 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
CVSS exploit maturity: proof of concept public
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), CVSS vector, the Metasploit, Exploit-DB and nuclei-templates index as of 30 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
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 or vendor guidance, organizations should implement several practical mitigations to reduce risk. First, apply strict input validation and output encoding on the 'page' parameter at the web application firewall (WAF) or reverse proxy level to block or sanitize malicious payloads. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. Educate users about the risks of clicking unknown or suspicious links, especially those purporting to be related to payroll or HR communications. Monitor web server logs for unusual requests targeting the 'page' parameter and implement anomaly detection to identify potential exploitation attempts. If possible, isolate the payroll management system in a segmented network zone with limited external access to reduce exposure. Consider deploying endpoint protection solutions that can detect and block malicious scripts. Finally, maintain regular backups of payroll data and prepare incident response plans to quickly address any compromise resulting from exploitation.

Description

A security flaw has been discovered in itsourcecode Payroll Management System up to 1.0. This affects an unknown function of the file /index.php. Performing a manipulation of the argument page results in cross site scripting. It is possible to initiate the attack remotely. The exploit has been released to the public and may be used for attacks.

Impact

The primary impact of this vulnerability is the potential compromise of user sessions and credentials through malicious script execution in the victim's browser. Attackers can hijack sessions, steal sensitive payroll data, or perform unauthorized actions within the payroll system under the guise of legitimate users. This can lead to financial fraud, data breaches involving employee personal and salary information, and reputational damage to affected organizations. Since payroll systems are critical for business operations and contain sensitive financial data, exploitation could disrupt payroll processing and cause operational downtime. The requirement for user interaction limits automated exploitation but does not eliminate risk, especially in environments where social engineering or phishing campaigns are common. The medium severity rating reflects the moderate but tangible risk to confidentiality and integrity, with no direct impact on system availability. Organizations worldwide using this payroll system version are at risk, particularly those with large employee bases or in sectors where payroll data is a lucrative target for attackers.

Summary

CVE-2026-4877 is a cross-site scripting (XSS) vulnerability identified in the itsourcecode Payroll Management System up to version 1.0. The vulnerability arises from improper input validation and sanitization of the 'page' parameter in the /index.php file. An attacker can craft a malicious URL that injects executable JavaScript code into the web application, which is then executed in the context of the victim's browser when they access the manipulated page. This type of vulnerability is classified as reflected XSS, as it requires the victim to click or visit a malicious link. The vulnerability is remotely exploitable without any authentication, making it accessible to unauthenticated attackers. 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 integrity (VI:L) with no impact on confidentiality or availability. Although no known exploits have been reported in the wild, the public release of an exploit increases the likelihood of active exploitation attempts. The vulnerability could be leveraged to steal session cookies, perform actions on behalf of authenticated users, or deliver further malware payloads. The lack of available patches or official vendor mitigation guidance at this time increases the urgency for organizations to implement alternative protective measures.

References

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