PT-2026-3404 · Mermaid+2 · Mermaid+2

C2An1 · Published 2026-01-18 · Updated 2026-01-20 · CVE-2026-23733

Positive Technologies (AI Summary)

CVSS v3.1

9.6

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions LobeChat versions prior to 2.0.0-next.180

Description LobeChat is an open source chat application platform. A stored Cross-Site Scripting (XSS) issue exists in the Mermaid artifact renderer, enabling attackers to execute arbitrary JavaScript within the application. This XSS can be escalated to Remote Code Execution (RCE) by exploiting the exposed electronAPI IPC bridge, which allows attackers to run arbitrary system commands on a victim’s machine. The vulnerable component is the Mermaid artifact renderer.

Recommendations Update to version 2.0.0-next.180 or later.

Exploit

Fix

RCE

Code Injection

Weakness Enumeration

CWE-94

Related Identifiers

CVE-2026-23733

GHSA-4GPC-RHPJ-9443

Affected Products

Lobe Chat

Mermaid

Electronapi

References · 9

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23733.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-23733 · Security Note
• https://osv.dev/vulnerability/CVE-2026-23733 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-4gpc-rhpj-9443 · Vendor Advisory
• https://github.com/lobehub/lobehub/security/advisories/GHSA-4gpc-rhpj-9443 · Note
• https://github.com/lobehub/lobe-chat · Note
• https://github.com/lobehub/lobe-chat/security/advisories/GHSA-4gpc-rhpj-9443 · Note
• https://twitter.com/VulmonFeeds/status/2013032335780835810 · Twitter Post
• https://twitter.com/CVEnew/status/2013027741692826017 · Twitter Post