CVE-2025-66918

HighPublic PoC

Published: 11 December 2025

Published

11 December 2025

Modified

23 December 2025

KEV Added

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Patch

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CVSS Score 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0010 27.9th percentile

Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-66918 is a high-severity Improper Input Validation (CWE-20) vulnerability in Hashenudara Edoc-Doctor-Appointment-System. Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 27.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-15 (Information Output Filtering).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-10 Information Input Validation good match

prevent

Directly enforces proper validation of the 'title' parameter in admin/add-session.php to block malicious script injection from improper input validation.

SI-15 Information Output Filtering good match

prevent

Mandates filtering and encoding of user-supplied 'title' data on output to prevent XSS script execution in victims' browsers.

SI-2 Flaw Remediation good match

prevent

Establishes a risk-based process to identify, prioritize, test, and remediate the specific XSS flaw in the vulnerable application component.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1185 Browser Session Hijacking Collection

Adversaries may take advantage of security vulnerabilities and inherent functionality in browser software to change content, modify user-behaviors, and intercept information as part of various browser session hijacking techniques.

attack.mitre.org →

Why these techniques?

XSS vulnerability in web application enables exploitation of public-facing application (T1190) and browser session hijacking via injected scripts to steal session cookies (T1185).

NVD Description

edoc-doctor-appointment-system v1.0.1 is vulnerable to Cross Site Scripting (XSS) in admin/add-session.php via the "title" parameter.

Deeper analysisAI

CVE-2025-66918 is a Cross-Site Scripting (XSS) vulnerability in edoc-doctor-appointment-system version 1.0.1, specifically affecting the admin/add-session.php component through the "title" parameter. This issue stems from CWE-20 (Improper Input Validation) and CWE-79 (Cross-site Scripting), earning a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). Published on 2025-12-11, it allows remote exploitation over the network with low complexity.

An authenticated attacker with low privileges (PR:L), such as an admin user, can exploit the vulnerability by injecting a malicious script into the "title" parameter during session addition. Upon execution in a victim's browser viewing the affected page, this enables high-impact outcomes, including compromise of confidentiality through data theft (e.g., session tokens), integrity violations via unauthorized actions, and availability disruptions, all without requiring user interaction.

Mitigation guidance and further details are available in the referenced GitHub repositories: the project source at https://github.com/HashenUdara/edoc-doctor-appointment-system and vulnerability research at https://github.com/omkaryepre/vulnerability-research/blob/main/CVE-2025-66918/readme.md. Security practitioners should review these for patches, input validation fixes, or workarounds specific to the application.