# CVE-2026-23733: Lobe Chat has Cross-Site Scripting (XSS) issue that may escalate to Remote Code Execution (RCE)

> Attackers can execute arbitrary JavaScript via stored XSS in the Mermaid renderer, escalating to remote code execution through the Electron IPC bridge.

- **Severity:** Medium 6.4 (`CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 18 Jan 2026
- **Updated:** 20 Jan 2026
- **Also known as:** GHSA-4gpc-rhpj-9443

## What is CVE-2026-23733?

CVE-2026-23733 is a medium-severity cross-site scripting vulnerability in lobehub lobe-chat, published on 18 Jan 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

LobeChat is an open source chat application platform. Prior to version 2.0.0-next.180, a stored Cross-Site Scripting (XSS) vulnerability in the Mermaid artifact renderer allows attackers to execute arbitrary JavaScript within the application context. This XSS can be escalated to Remote Code Execution (RCE) by leveraging the exposed `electronAPI` IPC bridge, allowing attackers to run arbitrary system commands on the victim's machine. Version 2.0.0-next.180 patches the issue.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2026-23733?

2 open source packages ship an affected version, including @lobehub/chat.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `@lobehub/chat` | npm | All versions to 1.143.2 | None |
| `@lobehub/chat` | npm | All versions to 1.143.2 | None |

## How do I fix CVE-2026-23733?

No fix has been published for CVE-2026-23733 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-23733 being exploited?

There is no known exploitation of CVE-2026-23733 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-23733 and fix it if it is affected.

What it is: CVE-2026-23733 is a medium-severity cross-site scripting vulnerability in lobehub lobe-chat, published on 18 Jan 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-23733 in the wild and no public exploit code.

Affected packages and fixed versions:
- @lobehub/chat (npm): affected all versions up to 1.143.2; no fix listed
- @lobehub/chat (npm): affected all versions up to 1.143.2; no fix listed

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-23733/ (Markdown: https://insights.sbomify.com/CVE-2026-23733/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-23733
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-23733
- OSV: https://osv.dev/vulnerability/CVE-2026-23733

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-23733/
Summaries are generated and may contain mistakes; the official description above is the record.