Auth bypass in Lobehub
CVE-2026-59100
LobeChat through 2.2.9 contains a broken object level authorization vulnerability that allows authenticated attackers to access and modify other users' chat-group agent data by supplying arbitrary group identifiers. Attackers can invoke the getGroupAgents, updateAgentInGroup, and removeAgentsFromGroup operations without user-scoped predicates to read agent listings, modify agent roles and ordering, and remove agents from chat groups belonging to other users.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (19.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Lobehub — versions 0
Weakness classification (CWE)
References
- github.com/lobehub/lobehub/commit/9ed5a7e20d8a67c431265f5a252e9559d9920907 (patch)
- github.com/lobehub/lobehub/issues/16537 (technical-description, exploit)
- github.com/lobehub/lobehub/pull/16586 (issue-tracking)
- www.vulncheck.com/advisories/lobechat-broken-object-level-authorization-via-cha… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-59100?
- CVE-2026-59100 is a medium-severity vulnerability in Lobehub, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.0/10. Published 2026-07-02.
- How severe is CVE-2026-59100?
- Medium severity. CVSS v3 base score is 5.0 out of 10.