CVE-2026-117679 in SHIRASAGI
Summary
by MITRE • 11/05/2026
A cross-site scripting vulnerability exists in SHIRASAGI, which may allow an authenticated attacker to execute arbitrary script in a user's web browser when the user accesses a website using the affected product.
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Analysis
by VulDB Data Team • 11/05/2026
The identified security flaw represents a classic Cross-Site Scripting (XSS) vulnerability within the SHIRASAGI software environment. This specific instance is categorized as an authenticated XSS, which significantly alters the threat landscape compared to unauthenticated variants. In this scenario, the attacker must first possess valid credentials and successfully authenticate into the application before they can exploit the flaw. The core technical deficiency lies in the improper neutralization of user-controllable input before it is included within web content. Specifically, when a user interacts with certain features or inputs data that is subsequently reflected back to them or stored for later retrieval by other users, the system fails to apply adequate output encoding or validation rules. This allows malicious JavaScript code to be injected into the page context rather than being treated as inert text data.
From an operational perspective, this vulnerability enables a remote attacker to execute arbitrary scripts in the victim's web browser under the guise of the trusted SHIRASAGI application. Because the script runs within the security context of the vulnerable website, it gains access to all cookies, session tokens, and other sensitive information typically accessible only to that domain. This capability allows for severe privacy violations and potential account takeover scenarios where an attacker can hijack active sessions. Furthermore, if the vulnerability permits persistent storage of the malicious payload, such as in a comment field or profile section, it transforms into a stored XSS attack vector. In this mode, every user who views the affected page becomes a potential victim without needing to interact directly with the initial injection point, thereby amplifying the blast radius of the exploit significantly.
The impact extends beyond simple script execution. An attacker can leverage these scripts to perform actions on behalf of the authenticated user, such as changing account settings, transferring funds if financial operations are supported, or exfiltrating sensitive organizational data stored within the application interface. Additionally, this vulnerability serves as a potent vector for phishing attacks where the injected content mimics legitimate login prompts or warning dialogs designed to trick users into revealing further credentials. The presence of authentication requirements does not mitigate the severity; rather, it restricts the attack surface to insider threats or compromised accounts while maintaining high impact potential due to the elevated privileges associated with authenticated sessions.
To address this vulnerability effectively, developers must implement strict input validation and output encoding strategies. Input validation should enforce a whitelist approach, ensuring that only expected characters and formats are accepted for each specific field. More critically, output encoding must be applied contextually based on where the data is rendered within the HTML structure, such as using HTML entity encoding for body content or JavaScript escaping for script blocks. Modern web frameworks often provide built-in mechanisms to handle this automatically, so ensuring these features are enabled and correctly configured is essential. Additionally, implementing a Content Security Policy (CSP) can serve as an effective defense-in-depth measure by restricting the sources from which scripts can be loaded and executed, thereby mitigating the impact even if injection occurs. Regular security testing including dynamic application security scanning should also be integrated into the development lifecycle to detect such flaws early before deployment.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-79, known as Improper Neutralization of Input During Web Page Generation commonly referred to as Cross-site Scripting. In terms of tactical classification within the MITRE ATT&CK framework, this falls under T1059 Command and Control via Application Layer Protocol or more specifically relates to techniques involving client-side code execution such as Client-Side Injection (T1059). Understanding these mappings helps in aligning remediation efforts with broader industry standards for web application security. Organizations should prioritize patching this issue given the direct link between authenticated access and potential data compromise, ensuring that all user inputs are rigorously sanitized before being processed or displayed by the SHIRASAGI system.