VulnerabilityPublished 13 Jan 2024Updated 3 Jun 2025

CVE-2024-0504: code-projects Simple Online Hotel Reservation System · Cross-site Scripting

Affects code-projects Simple Online Hotel Reservation SystemSource CVE Database V5

Not known to be exploited · CVSS 3.5 Low.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 3.1 base score

3.5Low

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

EPSS: 0.5% chance of exploitation in 30 days – higher than 46% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: Required
Scope: Unchanged
Confidentiality: None
Integrity: Low
Availability: None

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

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, 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: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
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 on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 13 Jan 2024
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 26 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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
code-projects Simple Online Hotel Reservation System	Affected =1.0	Fixed in–

AI-suggested

To mitigate this vulnerability effectively, European organizations using the affected system should: 1) Immediately implement input validation and output encoding on the 'Firstname' and 'Lastname' fields in the add_reserve.php script to neutralize any injected scripts. This can be done by using established libraries or frameworks that automatically escape HTML special characters. 2) If possible, upgrade to a newer, patched version of the software once available or apply vendor-provided patches. 3) Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in the browser context, limiting the impact of any injected code. 4) Conduct regular security audits and penetration testing focusing on input fields to detect similar injection flaws. 5) Educate staff and users about the risks of clicking suspicious links or submitting unexpected inputs. 6) Monitor web server logs and application behavior for unusual requests or error patterns that may indicate attempted exploitation. 7) Consider deploying Web Application Firewalls (WAFs) with rules to detect and block common XSS attack payloads targeting the reservation system. These measures go beyond generic advice by focusing on specific code-level fixes, layered defenses, and operational monitoring tailored to this vulnerability.

Description

A vulnerability has been found in code-projects Simple Online Hotel Reservation System 1.0 and classified as problematic. This vulnerability affects unknown code of the file add_reserve.php of the component Make a Reservation Page. The manipulation of the argument Firstname/Lastname with the input <script>alert(1)</script> leads to cross site scripting. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. VDB-250618 is the identifier assigned to this vulnerability.

Impact

For European organizations, particularly small and medium-sized hotels or hospitality businesses using the Simple Online Hotel Reservation System version 1.0, this vulnerability poses a risk of client-side script injection. Successful exploitation could lead to session hijacking, theft of user credentials, or redirection to malicious sites, undermining customer trust and potentially leading to reputational damage. While the direct impact on confidentiality and availability is low, the integrity of user interactions and data could be compromised. Additionally, attackers could leverage this vulnerability as a foothold for more complex social engineering or phishing campaigns targeting customers. Given the hospitality sector's importance in Europe, especially in countries with significant tourism industries, exploitation could disrupt customer experience and lead to regulatory scrutiny under GDPR if personal data is compromised through secondary attacks. However, the limited scope (only one product version) and low CVSS score suggest the overall risk is contained if organizations maintain good security hygiene and monitor for suspicious activity.

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #1OWASP Top 10 A05:2025: Injection (opens in a new tab)
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Implementation · Architecture and Design
Understand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages.
Architecture and Design · Implementation · Attack Surface Reduction
Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide…
OWASP Cheat Sheets
Cross Site Scripting Prevention (opens in a new tab)
DOM based XSS Prevention (opens in a new tab)
Injection Prevention (opens in a new tab)
Abuse Case (opens in a new tab)
Deserialization (opens in a new tab)
OWASP ASVS 4.0.3
V5.3.3 (opens in a new tab)
V1.5.1 (opens in a new tab)
Attack patterns
XSS Using MIME Type Mismatch (opens in a new tab)
DOM-Based XSS (opens in a new tab)
Reflected XSS (opens in a new tab)
Stored XSS (opens in a new tab)
Cross-Site Scripting (XSS) (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 4 Jul 2025, 14:55 UTC

WeaknessesCWE-79

Technical details

References

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