gcdRadar
archive/Patch now/AIR-2026-0434
closedclosed 20 Jan 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-23733: Lobe Chat Cross-Site Scripting via Mermaid Artifact Renderer

Lobe Chat

A stored cross-site scripting vulnerability exists in the Mermaid diagram renderer component of Lobe Chat. Attackers can execute arbitrary JavaScript within the application context, escalating to remote code execution.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
9.6
EPSS
<0.01 · top 97% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
20 Jan 2026
last update
20 Jan 2026
CVE ids
CVE-2026-23733other records

Timeline · 1

  1. 20 Jan 2026CVE-2026-23733: Lobe Chat affected by Cross-Site Scripting(XSS) that can escalate to Remote Code Execution(RCE)

Sources · 1

Advisories and databases

  1. 2026-01-20
    CVE-2026-23733: Lobe Chat affected by Cross-Site Scripting(XSS) that can escalate to Remote Code Execution(RCE)
    GitHub Advisory Database · github.com/advisories/GHSA-4gpc-rhpj-9443

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
xssrce
dates
happened 20 Jan 2026 · first reported 20 Jan 2026
origin
GitHub Advisory Database
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 07:00Z · updated 2026-10-18 07:00Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2026-23733: Lobe Chat Cross-Site Scripting via Mermaid Artifact Renderer

https://gcdradar.vercel.app/incidents/cve-2026-23733-lobe-chat-cross-site-scripting-via-mermaid-ar · AIR-2026-0434 · closed 2026-01-20

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-01-20
- AI role: Attack on AI
- Products: Lobe Chat
- CVE ids: CVE-2026-23733
- CVSS: 9.6

## Summary

A stored cross-site scripting vulnerability exists in the Mermaid diagram renderer component of Lobe Chat. Attackers can execute arbitrary JavaScript within the application context, escalating to remote code execution.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-01-20: CVE-2026-23733: Lobe Chat affected by Cross-Site Scripting(XSS) that can escalate to Remote Code Execution(RCE) (https://github.com/advisories/GHSA-4gpc-rhpj-9443)

## Sources

- 2026-01-20 GitHub Advisory Database: CVE-2026-23733: Lobe Chat affected by Cross-Site Scripting(XSS) that can escalate to Remote Code Execution(RCE) https://github.com/advisories/GHSA-4gpc-rhpj-9443

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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