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TI-2026-74105 Aliases CVE-2026-110611GHSA-c434-7979-wrg6

Authorization bypass in REBUILD aibot2 chat endpoints

Priority MEDIUM 60CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · Low · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

REBUILD through 4.5.0 contains an authorization bypass in the AiBot2Controller /aibot2 endpoints, which act on a caller-supplied chatid without checking ownership. An authenticated low-privilege user can supply another user's chatid to read, delete, or interrupt that user's AI assistant conversations. The flaw is tracked as CWE-639 (authorization bypass through a user-controlled key).

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00379 32nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
getrebuildrebuildup to 4.5.0—No fix listedCNA
  • rebuild Vendorgetrebuild Affected up to 4.5.0 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for rebuild.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

  1. 2026-10-14 Threatist record created from CVE-2026-110611
  2. 2026-10-14 Alias added: GHSA-c434-7979-wrg6
  3. 2026-10-16 Priority changed: MEDIUM → LOW
  4. 2026-10-20 CISA SSVC decision points changed
  5. 2026-10-20 Priority changed: LOW → MEDIUM

References

Advisory 1

Other 2

  • TI-2025-32265 An issue was discovered in getrebuild/rebuild 4.0.4. CVSS 3.1CRITICAL 9.8
  • TI-2026-75453 REBUILD Missing Authorization in Task Comment Listing Endpoint CVSS 4.0MEDIUM 5.3
  • TI-2024-30956 Rebuild v3.7.7 was discovered to contain a Server-Side Request Forgery (SSRF) via the… CVSS 3.1MEDIUM 5.1
  • TI-2024-16676 An SSRF issue in REBUILD v.3.5 allows a remote attacker to obtain sensitive information… CVSS 3.1CRITICAL 9.1
  • TI-2023-02323 Rebuild cross-site request forgery CVSS 3.1MEDIUM 4.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences