CVE-2025-62320 in Sametime
Summary
by MITRE • 03/17/2026
HTML Injection can be carried out in Product when a web application does not properly check or clean user input before showing it on a webpage. Because of this, an attacker may insert unwanted HTML code into the page. When the browser loads the page, it may automatically interact with external resources included in that HTML, which can cause unexpected requests from the user’s browser.
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Analysis
by VulDB Data Team • 03/22/2026
This vulnerability represents a critical html injection flaw that undermines the security posture of web applications by failing to properly validate and sanitize user input before rendering it within web pages. The weakness allows malicious actors to inject arbitrary html code into application responses, potentially enabling them to execute unauthorized actions or manipulate application behavior. The vulnerability stems from inadequate input validation mechanisms that permit html tags and scripts to pass through without proper sanitization, creating an attack surface where user-provided data can be interpreted as executable code rather than mere text content.
The technical implications of this html injection vulnerability extend beyond simple content manipulation, as browsers will process injected html elements according to standard parsing rules. When malicious html code containing external resource references such as script tags, image tags with src attributes pointing to malicious domains, or iframe elements is rendered, the browser automatically attempts to fetch and execute these resources. This behavior enables attackers to perform various malicious activities including cross-site scripting attacks, credential theft through form submission interception, or redirection to phishing sites. The vulnerability aligns with cwe-79 which specifically addresses cross-site scripting vulnerabilities arising from improper input handling and html injection flaws.
From an operational perspective, this vulnerability can lead to severe consequences including unauthorized data access, session hijacking, and potential compromise of user accounts. The automatic execution of external resources by browsers means that even a single injection point can result in multiple attack vectors being simultaneously exploited. Attackers can leverage this weakness to establish persistent command and control channels, harvest sensitive information from user sessions, or perform actions on behalf of authenticated users. The impact is particularly concerning in applications where users can submit content that gets displayed to other users, as it creates a potential for widespread compromise across multiple user accounts.
Mitigation strategies must focus on implementing robust input validation and output encoding mechanisms throughout the application lifecycle. Developers should employ context-specific output encoding for all user-supplied data before rendering it within html contexts, utilizing libraries and frameworks that provide automatic escaping mechanisms. The implementation of content security policies can help prevent unauthorized script execution even if injection occurs, while proper input sanitization using allowlists of permitted characters and html elements can prevent malicious code insertion. Regular security testing including dynamic application security testing and manual code reviews should be conducted to identify potential injection points, with adherence to secure coding practices that align with owasp top ten and iso 27001 security requirements. Additionally, implementing proper access controls and monitoring for unusual resource requests can help detect exploitation attempts and provide early warning of potential compromises.