CVE-2025-51860 is a stored Cross-Site Scripting (XSS) vulnerability identified in the TelegAI platform, specifically affecting its chat component and character container component. The vulnerability arises from improper sanitization of user-supplied input fields such as AI Character descriptions, greetings, example dialogs, or system prompts. An attacker can craft an AI Character embedding malicious SVG-based XSS payloads within these fields. When a legitimate user views or interacts with the malicious AI Character's profile or chat interface, the embedded script executes in the user's browser context. This execution can lead to the theft of sensitive information such as session tokens, enabling account hijacking and further unauthorized actions within the platform. The vulnerability exploits the trust relationship between the user and the platform by injecting scripts that run client-side, bypassing typical server-side protections. The absence of a CVSS score indicates that the vulnerability is newly published and not yet fully assessed, but the technical details confirm the potential for significant impact. No patches or known exploits in the wild have been reported as of the publication date, but the nature of stored XSS vulnerabilities typically allows persistent exploitation once weaponized. The vulnerability's exploitation requires the attacker to create or modify AI Characters with malicious payloads, but no user authentication is necessarily required to view the malicious content, increasing the attack surface. The use of SVG payloads suggests a sophisticated evasion technique to bypass common input sanitization filters. Overall, this vulnerability represents a critical client-side security risk within the TelegAI platform's user interaction model.

For European organizations using TelegAI, this vulnerability poses a significant risk to user confidentiality and platform integrity. Successful exploitation can lead to session hijacking, allowing attackers to impersonate legitimate users, access sensitive conversations, and potentially escalate privileges within the platform. This could result in data breaches involving proprietary or personal information, undermining trust and compliance with data protection regulations such as GDPR. The stored nature of the XSS means malicious payloads persist and can affect multiple users over time, increasing the likelihood of widespread compromise. Additionally, attackers could leverage the vulnerability to distribute malware or conduct phishing campaigns by injecting deceptive content into AI Character interactions. The impact extends beyond individual users to organizational security posture, as compromised accounts might be used to infiltrate internal communications or exfiltrate confidential data. Given the increasing adoption of AI-driven communication tools in European enterprises, this vulnerability could disrupt business operations and damage reputations if exploited.

To mitigate this vulnerability, organizations should implement strict input validation and output encoding on all user-supplied fields within the TelegAI platform, especially those that accept rich content such as SVGs. Employing a robust Content Security Policy (CSP) that restricts script execution sources can significantly reduce the risk of XSS exploitation. Regularly updating the platform with vendor patches once available is critical. In the interim, administrators should monitor AI Character creations for suspicious or malformed SVG content and consider disabling or restricting the use of SVGs in user-generated content. User education on recognizing phishing attempts and suspicious AI Characters can also reduce successful exploitation. Additionally, implementing multi-factor authentication (MFA) can limit the impact of session token theft by requiring additional verification for account access. Logging and anomaly detection systems should be enhanced to identify unusual user behavior indicative of account compromise. Finally, organizations should engage with TelegAI support to advocate for timely security updates and transparency regarding vulnerability remediation.