Lobe Chat has IDOR in Knowledge Base File Removal that Allows Cross User File Deletion

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

3.7 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS

• CVE-2026-23522: 0.24% estimated exploitation activity in the next 30 days; percentile 14.55 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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 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.

Published by the source

20 Jan 2026, 17:14 UTC

Last modified by the source

3 Feb 2026, 03:02 UTC

Source last checked

26 Oct 2026, 12:41 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-j7xp-4mg9-x28r

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-j7xp-4mg9-x28r

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# Patch Next advisory brief: CVE-2026-23522

Advisory: Lobe Chat has IDOR in Knowledge Base File Removal that Allows Cross User File Deletion
IDs: CVE-2026-23522, GHSA-j7xp-4mg9-x28r
Record: https://patchnext.com/advisories/cve-2026-23522 (revision 2, source checked 26 Oct 2026, 12:41 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 3.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @lobehub/chat: affected <= 1.143.2

## Suggested inspection (read-only)
- `npm ls @lobehub/chat --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @lobehub/chat.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-j7xp-4mg9-x28r (OSV record GHSA-j7xp-4mg9-x28r lists affected ranges: npm @lobehub/chat >=0 <=1.143.2)
- Verified: https://github.com/advisories/GHSA-j7xp-4mg9-x28r (GitHub-reviewed advisory GHSA-j7xp-4mg9-x28r lists affected ranges: npm @lobehub/chat >=0 <=1.143.2)

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