# CVE-2026-110611: REBUILD authorization bypass in AiBot2Controller

Source: https://junglewise.ai/threats/cve-2026-110611-rebuild-through-4-5-0-contains-an-authorization-bypass  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-14. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-110611 · Severity: medium · CVSS 5.9 · Published 2026-10-14

REBUILD is an open-source business process management platform whose AI chatbot component (AiBot2) fails to verify that users own the conversations they access. An authenticated user can read, delete, or interrupt another user's AI assistant conversations by submitting someone else's conversation ID to the chat endpoints, leading to unauthorized data exposure and service disruption.

Technologies: [REBUILD](https://junglewise.ai/threats/technologies/rebuild). Vendors: [REBUILD](https://junglewise.ai/threats/vendors/rebuild).

## Quick answers

**Is CVE-2026-110611 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-110611 being exploited in the wild.

**How severe is CVE-2026-110611?** Medium severity, with a CVSS score of 5.9, published 14 October 2026.

**Which products and versions are affected?** REBUILD through 4.5.0.

**Is there a fix for CVE-2026-110611?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-110611 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-110611?** Check whether you run REBUILD at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An authorization bypass in AiBot2Controller's /aibot2 endpoints (chat-init, chat-delete, chat-feedback, chat-stream-stop) accepts caller-supplied chatid parameters without validating ownership. Authenticated low-privilege users can supply an arbitrary chatid to read conversation content, delete conversations, exfiltrate data, or interrupt AI operations. The vulnerability requires authentication but no elevated privileges.

## Affected products

- REBUILD REBUILD through 4.5.0

## Timeline

- 2026-10-14: disclosed

## References

- [https://github.com/](https://github.com/)
- [https://github.com/getrebuild/rebuild/blob/48c6cc42f9c331cc57c057fa9c66d6cbda990131/src/main/java/com/rebuild/core/aibot2/ChatManager.java](https://github.com/getrebuild/rebuild/blob/48c6cc42f9c331cc57c057fa9c66d6cbda990131/src/main/java/com/rebuild/core/aibot2/ChatManager.java)

## Related threats

- [REBUILD authorization bypass in FeedsListController](https://junglewise.ai/threats/cve-2026-125372-rebuild-before-4-5-3-contains-an-authorization-bypass)
- [REBUILD authorization bypass in task comment listing](https://junglewise.ai/threats/cve-2026-111667-rebuild-through-4-5-0-contains-a-missing-authorization)
- [REBUILD announcement preview stored XSS via HTML entity decoding](https://junglewise.ai/threats/cve-2026-71802-rebuild-announcement-preview-stored-xss-via-html-entity-decoding)