Auth bypass in Lobehub
CVE-2026-59098
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (33.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Lobehub — versions 0
Weakness classification (CWE)
References
- github.com/lobehub/lobehub/commit/4a7931a4e66832947dba11afdffae2918a56b6a0 (patch)
- github.com/lobehub/lobehub/issues/16535 (technical-description, exploit)
- github.com/lobehub/lobehub/pull/16594 (issue-tracking)
- www.vulncheck.com/advisories/lobechat-cross-user-document-disclosure-via-unscop… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-59098?
- CVE-2026-59098 is a medium-severity vulnerability in Lobehub, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-07-02.
- How severe is CVE-2026-59098?
- Medium severity. CVSS v3 base score is 6.5 out of 10.