VulnerabilityPublished 23 Feb 2026Updated 25 Feb 2026

CVE-2026-3043: itsourcecode Event Management System · Cross-site Scripting

Affects itsourcecode Event Management SystemSource CVE Database V5

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Public exploit available · CVSS 5.3 Medium.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 4.0 base score

5.3Medium

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

EPSS: 0.3% chance of exploitation in 30 days – higher than 24% 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 23 Feb 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 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
itsourcecodeEvent Management System	Affected =1.0	Fixed in–

AI-suggested

To mitigate CVE-2026-3043, organizations should implement strict input validation and output encoding on the 'page' parameter within /admin/navbar.php to prevent injection of malicious scripts. Employing a web application firewall (WAF) with rules targeting XSS payloads can provide an additional layer of defense. Restricting access to the administrative interface by IP whitelisting or VPN-only access reduces exposure to remote attackers. Encouraging users to avoid clicking on suspicious links and educating administrators about phishing risks can limit successful exploitation. Monitoring web server logs for unusual requests targeting the 'page' parameter can help detect attempted attacks. Until an official patch is released, consider applying custom code fixes or disabling vulnerable features if feasible. Regularly updating the event management system to newer, patched versions when available is essential for long-term security.

Description

A flaw has been found in itsourcecode Event Management System 1.0. The impacted element is an unknown function of the file /admin/navbar.php. Executing a manipulation of the argument page can lead to cross site scripting. The attack may be performed from remote. The exploit has been published and may be used.

Impact

The impact of CVE-2026-3043 on organizations can be significant, especially those relying on the itsourcecode Event Management System 1.0 for managing events and administrative tasks. Successful exploitation can lead to session hijacking, unauthorized actions performed with administrative privileges, and theft of sensitive information such as authentication tokens or personal data. This can result in compromised user accounts, defacement of event management portals, or redirection to phishing sites, undermining user trust and organizational reputation. Although the vulnerability does not directly affect system availability, the indirect consequences of compromised credentials or administrative access could lead to broader security incidents. Organizations with public-facing administrative interfaces are particularly at risk, as attackers can remotely deliver malicious payloads. The lack of an official patch increases the urgency for implementing compensating controls to mitigate potential exploitation.

Summary

CVE-2026-3043 identifies a cross-site scripting vulnerability in the itsourcecode Event Management System version 1.0, specifically within the /admin/navbar.php file. The vulnerability arises from improper sanitization of the 'page' parameter, which an attacker can manipulate to inject malicious JavaScript code. When a victim user accesses a crafted URL containing the malicious payload, the script executes within their browser context, potentially stealing session cookies, performing actions on behalf of the user, or redirecting to malicious sites. The vulnerability is remotely exploitable without requiring authentication, though user interaction (clicking or visiting a malicious link) is necessary to trigger the attack. The CVSS v4.0 score is 5.3 (medium), reflecting the ease of remote exploitation but requiring user interaction and the limited impact on availability. No patches or fixes have been officially released, and no known exploits are currently active in the wild, but the public availability of exploit code increases the risk of future attacks. The vulnerability primarily threatens the confidentiality and integrity of user sessions and data within the event management system's administrative interface.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 3 Mar 2026, 01:19 UTC

Technical details

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