CVE-2023-30758 in Pleasanter
Summary
by MITRE • 06/01/2023
Cross-site scripting vulnerability in Pleasanter 1.3.38.1 and earlier allows a remote authenticated attacker to inject an arbitrary script.
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Analysis
by VulDB Data Team • 12/24/2025
The CVE-2023-30758 vulnerability represents a critical cross-site scripting flaw discovered in Pleasanter version 1.3.38.1 and earlier releases, exposing organizations to significant security risks. This vulnerability specifically affects the web application's input validation mechanisms, allowing authenticated attackers to inject malicious scripts into the application's user interface. The flaw exists within the application's handling of user-supplied data, particularly in contexts where user inputs are rendered back to other users without proper sanitization or encoding. The vulnerability is particularly concerning because it requires only authentication to exploit, meaning that attackers who have gained legitimate access to the system can leverage this weakness to escalate their privileges and compromise other users. The affected Pleasanter application likely processes user inputs through various forms, comments, or configuration fields where the absence of proper input validation creates opportunities for script injection. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is classified as a critical weakness in web applications that fail to properly validate or encode user-supplied data. The operational impact of this vulnerability extends beyond simple script execution, as attackers can potentially steal session cookies, perform actions on behalf of authenticated users, or redirect victims to malicious websites. The vulnerability's exploitation typically involves crafting malicious payloads that bypass the application's security controls, often leveraging the fact that the application does not adequately sanitize or encode user inputs before rendering them in web pages. The presence of this vulnerability in Pleasanter 1.3.38.1 and earlier versions indicates a fundamental flaw in the application's security architecture, where input validation is insufficient to prevent malicious code execution within the context of legitimate user sessions. From an attacker's perspective, this vulnerability aligns with ATT&CK technique T1566.001 which involves the use of phishing attacks to deliver malicious scripts, though in this case the attack vector involves authenticated access rather than initial compromise. The security implications are particularly severe because authenticated users already have access to application functionality, making it easier for attackers to craft sophisticated attacks that can persist across multiple user sessions. The vulnerability's exploitation can lead to session hijacking, data theft, privilege escalation, and potential lateral movement within the application's user base. Organizations utilizing Pleasanter must urgently implement mitigations to prevent exploitation of this vulnerability. The most effective approach involves implementing comprehensive input validation and output encoding mechanisms throughout the application, particularly in areas where user inputs are processed and displayed. Additionally, the application should be updated to a patched version that addresses the specific XSS vulnerability in the input handling code. Security measures should include implementing Content Security Policy headers, proper HTML encoding of user inputs, and regular security audits of input validation routines. The vulnerability highlights the importance of secure coding practices and proper input sanitization in preventing cross-site scripting attacks, as outlined in OWASP's top ten security risks and the broader security framework established by industry standards. Organizations should also consider implementing web application firewalls and monitoring systems to detect potential exploitation attempts. The remediation process requires not only patching the specific vulnerability but also conducting thorough security assessments of the application's input handling mechanisms to ensure no similar weaknesses exist in other areas of the codebase.
The vulnerability's presence in Pleasanter 1.3.38.1 and earlier versions indicates a critical failure in the application's security architecture that directly violates fundamental principles of secure web application development. The flaw demonstrates how insufficient input validation and output encoding can create persistent security risks that remain exploitable even after initial authentication. This weakness enables attackers to inject malicious scripts that can execute in the context of other users' browsers, potentially leading to complete compromise of user sessions and sensitive data exposure. The vulnerability's classification under CWE-79 emphasizes the need for comprehensive security controls that address both the prevention and detection of cross-site scripting attacks. From a threat modeling perspective, this vulnerability represents a significant risk to the confidentiality and integrity of user data within the Pleasanter application environment. The exploitation of this vulnerability can result in unauthorized access to sensitive information, modification of user data, and potential privilege escalation within the application's user management system. The security implications extend beyond immediate script execution to include potential for more sophisticated attacks such as credential theft, session fixation, or browser-based attacks that can leverage the authenticated context to perform actions beyond the attacker's initial access level. Organizations should prioritize immediate patching of the affected Pleasanter versions and implement additional security controls to prevent similar vulnerabilities from emerging in future application development cycles. The vulnerability serves as a reminder of the critical importance of input validation, output encoding, and comprehensive security testing in preventing web application vulnerabilities that can be exploited by authenticated attackers to compromise other users within the same application environment.