CVE-2026-110611CWE-639

CVE-2026-110611

Medium · published October 14, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
26.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N
CVSS v4.0
6.0 · CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00339 · 26.1th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-10-14T19:17Z
References (5)
https://github.com/getrebuild/rebuild/blob/48c6cc42f9c331cc57c057fa9c66d6cbda990131/src/main/java/com/rebuild/core/aibot2/ChatManager.java#L99-L101 · [email protected]https://github.com/getrebuild/rebuild/blob/48c6cc42f9c331cc57c057fa9c66d6cbda990131/src/main/java/com/rebuild/web/aibot/AiBot2Controller.java#L151-L203 · [email protected]https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/getrebuild-rebuild-aibot-chat-idor · [email protected]https://www.vulncheck.com/advisories/rebuild-through-4.5.0-authorization-bypass-via-aibot2-chat-endpoints-chatid · [email protected]https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/getrebuild-rebuild-aibot-chat-idor · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 16 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 14 OCT 14:16Z
    REBUILD through 4.5.0 Authorization Bypass via aibot2 Chat Endpoints chatid
    cvelistv5
  • 14 OCT 14:16Z
    REBUILD through 4.5.0 Authorization Bypass via aibot2 Chat Endpoints chatid
    cvelistv5