VulnerabilityPublished 9 Mar 2026

CVE-2026-3819: SourceCodester Resort Reservation System · Cross-site Scripting

Affects SourceCodester Resort Reservation SystemSource CVE Database V5

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Public exploit available · CVSS 5.1 Medium.

Data as of 30 Oct 2026, 11:52 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 19% 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 9 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
SourceCodesterResort Reservation System	Affected =1.0	Fixed in–

AI-suggested

To mitigate CVE-2026-3819, organizations should first seek any official patches or updates from SourceCodester for the Resort Reservation System version 1.0. If patches are unavailable, implement strict input validation on the 'ID' parameter to ensure only expected data types and formats are accepted. Employ output encoding techniques, such as HTML entity encoding, to neutralize any injected scripts before rendering user-supplied input in the browser. Additionally, implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts. Regularly audit and monitor web application logs for suspicious requests targeting the /?page=manage_reservation endpoint. Educate users about the risks of clicking on untrusted links and consider deploying web application firewalls (WAFs) with rules to detect and block XSS payloads. Finally, conduct security testing, including automated scanning and manual penetration testing, to identify and remediate similar vulnerabilities proactively.

Description

A vulnerability has been found in SourceCodester Resort Reservation System 1.0. The affected element is an unknown function of the file /?page=manage_reservation of the component Reservation Management Module. Such manipulation of the argument ID leads to cross site scripting. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.

Impact

The primary impact of CVE-2026-3819 is the potential compromise of user session data and the integrity of the web application interface. Successful exploitation can lead to theft of authentication tokens, enabling attackers to impersonate users or escalate privileges. It can also facilitate phishing attacks by redirecting users to malicious sites or displaying fraudulent content. For organizations operating the affected Resort Reservation System, this can result in unauthorized access to sensitive reservation data, customer information, and potential reputational damage. Although availability is not directly impacted, the loss of trust and potential regulatory consequences related to data breaches can have significant business implications. The vulnerability's remote exploitability and lack of required authentication increase the risk, especially in environments where users may be less security-aware. The medium severity rating reflects these factors, indicating a moderate but actionable threat to confidentiality and integrity.

Summary

CVE-2026-3819 is a cross-site scripting (XSS) vulnerability affecting SourceCodester Resort Reservation System version 1.0. The vulnerability resides in the Reservation Management Module, specifically within an unknown function that processes the 'ID' parameter on the /?page=manage_reservation page. By manipulating this parameter, an attacker can inject malicious JavaScript code that is then executed in the context of the victim's browser. This type of vulnerability allows attackers to perform actions such as stealing session cookies, defacing web content, or redirecting users to malicious sites. The attack vector is remote and does not require authentication, but it does require user interaction, such as clicking on a malicious link. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:L), and user interaction required (UI:P). The impact on confidentiality and integrity is low, with no impact on availability. Although no public exploits have been observed in the wild, the public disclosure increases the likelihood of exploitation attempts. The vulnerability highlights insufficient input validation and output encoding in the affected module, which should be addressed to prevent script injection.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 9 Mar 2026, 13:07 UTC

Technical details

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