Vulnerability · Published Jul 2, 2026 · Assigned by VulnCheck

CVE-2026-59098LobeChat 2.2.9 - Cross-User Document Disclosure via Unscoped RAG Semantic Search

Medium 6.5

In plain English

A medium-severity authorization bypass via user-controlled key in lobehub from lobehub. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 64.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

LobeChat through 2.2.9 contains a broken access control vulnerability in the retrieval-augmented-generation semantic search functionality that allows authenticated attackers to access other users' data by exploiting missing user-identifier predicates in the chunk model semanticSearch method. Attackers can supply arbitrary victim file or knowledge-base identifiers through the chunk retrieval and chat knowledge-base paths to retrieve text content, file names, and metadata belonging to other users.

Affected products (as reported)

Vendor	Product	Versions
lobehub	lobehub	0 – through 2.2.9

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

Researcher Disclosure technical-description, exploit
Fix PR issue-tracking
Fix Commit patch
https://www.vulncheck.com/advisories/lobechat-cross-user-document-disclosure-via-unscoped-rag-semantic-search third-party-advisory