Auth bypass in Thinkgem Jeesite
CVE-2026-119048
JeeSite 5.11.0 through 5.19.1 contains an insecure direct object reference vulnerability in the AI CMS chat module that allows authenticated users to access other users' conversations due to missing and reversed ownership checks. Attackers who know or derive a victim's conversation id can call /a/cms/chat/message, /a/cms/chat/delete, or /a/cms/chat/completions to read, delete, or append to the victim's AI chat transcripts.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/thinkgem/jeesite5/issues/43 (issue-tracking)
- github.com/thinkgem/jeesite5 (product)
- github.com/thinkgem/jeesite5/commit/cbc5ba7a37fd93f38c46ef656bd31442fe6f8015 (patch)
- github.com/thinkgem/jeesite5/blob/5b5e2cf0adc45a1abe33d0f4ca149590d149b82d/modu… (technical-description)
- github.com/thinkgem/jeesite5/blob/5b5e2cf0adc45a1abe33d0f4ca149590d149b82d/modu… (technical-description)
- hackmd.io/@hieund/jeesite5-ai-cms-chat-conversation-idor (technical-description)
- www.vulncheck.com/advisories/jeesite-5.11.0-through-5.19.1-idor-in-ai-cms-chat-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-119048?
- CVE-2026-119048 is a medium-severity vulnerability in Thinkgem Jeesite, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.2/10. Published 2026-10-29.
- How severe is CVE-2026-119048?
- Medium severity. CVSS v3 base score is 4.2 out of 10.