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TI-2026-04320 Aliases CVE-2026-4959GHSA-7355-47hq-rrv2

OpenBMB XAgent ShareServer WebSocket Endpoint share.py check_user missing authentication

Priority HIGH 70CWE-287Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-287.

Summary

A vulnerability was found in OpenBMB XAgent 1.0.0. This impacts the function check_user of the file XAgentServer/application/websockets/share.py of the component ShareServer WebSocket Endpoint. Performing a manipulation of the argument interaction_id results in missing authentication. Remote exploitation of the attack is possible. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00447 39th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
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
OpenBMBXAgent1.0.0—No fix listedCNA
  • XAgent VendorOpenBMB Affected 1.0.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:openbmb:xagent:1.0.0:*:*:*:*:*:*:*1.0.0VulnerableOpenBMB
  • cpe:2.3:a:openbmb:xagent:1.0.0:*:*:*:*:*:*:* Versions 1.0.0 Vulnerable ·OpenBMB

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-4959
  2. 2026-10-03 Alias added: GHSA-7355-47hq-rrv2
  3. 2026-10-25 EPSS moved to the below the 50th percentile

References

Exploit 1

  • TI-2024-01867 OpenBMB XAgent Privileged Mode sandbox CVSS 3.1HIGH 8.8
  • TI-2026-04318 OpenBMB XAgent API Key function_handler.py FunctionHandler.handle_tool_call log file CVSS 4.0MEDIUM 5.1
  • TI-2025-05683 OpenBMB XAgent community path traversal CVSS 4.0MEDIUM 5.1
  • TI-2026-04319 OpenBMB XAgent WebSocket Endpoint replayer.py ReplayServer.send_data authorization CVSS 4.0LOW 2.3

Sources

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