Authorization Bypass Vulnerability in OpenBMB XAgent 1.0.0
CVE-2026-4958

2.3LOW

Key Information:

Vendor

Openbmb

Status
Xagent
Vendor
CVE Published:
27 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4958?

A vulnerability has been identified in OpenBMB XAgent 1.0.0 that allows an attacker to bypass authorization through manipulation of the interaction_id argument in the WebSocket Endpoint's replay functionality. Specifically, this affects the ReplayServer.on_connect and ReplayServer.send_data functions, leading to significant security concerns. The exploit can be executed remotely, although it requires a complex execution process. This vulnerability has been publicly disclosed, raising the urgency for users to assess their systems and apply necessary mitigations.

Affected Version(s)

XAgent 1.0.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-4958 - Proof of Concept

References

https://vuldb.com/?id.353835
vdb-entrytechnical-description
https://vuldb.com/?ctiid.353835
signaturepermissions-required
https://vuldb.com/?submit.777618
third-party-advisory

CVSS V4

Score:
2.3
Severity:
LOW
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Eric-z (VulDB User)
VulDB
.