Auth bypass in Getrebuild Rebuild
CVE-2026-110611
REBUILD through 4.5.0 contains an authorization bypass vulnerability in AiBot2Controller /aibot2 endpoints that act on a caller-supplied chatid without verifying ownership. Authenticated low-privilege users can supply another user's chatid to chat-init, chat-delete, chat-feedback, or chat-stream-stop to read, delete, exfiltrate, or interrupt AI assistant conversations.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/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
- hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/getrebuild-rebuild-aibot-chat-idor (third-party-advisory)
- github.com/getrebuild/rebuild/blob/48c6cc42f9c331cc57c057fa9c66d6cbda990131/src… (technical-description)
- github.com/getrebuild/rebuild/blob/48c6cc42f9c331cc57c057fa9c66d6cbda990131/src… (technical-description)
- www.vulncheck.com/advisories/rebuild-through-4.5.0-authorization-bypass-via-aib… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-110611?
- CVE-2026-110611 is a medium-severity vulnerability in Getrebuild Rebuild, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.9/10. Published 2026-10-14.
- How severe is CVE-2026-110611?
- Medium severity. CVSS v3 base score is 5.9 out of 10.