PT-2025-34377 · Nextchat · Nextchat

Fai1424 · Published 2025-08-22 · Updated 2025-08-26 · CVE-2025-50733

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions: NextChat (affected versions not specified)

Description: NextChat contains a cross-site scripting (XSS) issue in the HTMLPreview component of artifacts.tsx. This allows attackers to execute arbitrary JavaScript code when HTML content is rendered in the AI chat interface. The vulnerability occurs because user-influenced HTML from AI responses is rendered in an iframe with 'allow-scripts' sandbox permission without proper sanitization. Attackers can exploit this through crafted prompts that cause the AI to generate malicious HTML/JavaScript code. When a user views the HTML preview, the injected JavaScript executes in the user's browser context, potentially allowing attackers to exfiltrate sensitive information (including API keys stored in localStorage), perform actions on behalf of the user, and steal session data.

Recommendations: At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2025-50733

Affected Products

Nextchat

References · 6

• 🔥 https://github.com/fai1424/Vulnerability-Research/blob/main/CVE-2025-50733/README.md · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2025-50733 · Security Note
• https://t.me/cveNotify/133465 · Telegram Post
• https://twitter.com/CVEnew/status/1958919769131729290 · Twitter Post
• https://twitter.com/VulmonFeeds/status/1959034313241969069 · Twitter Post
• https://hackmd.io/@fai1424/BkgqMnNxgl · Note