Which versions of Xagent are affected by CVE-2026-4958?

CVE-2026-4958 is a low-severity vulnerability in A vulnerability (CVSS 2.3). The limited severity suggests constrained impact, typically requiring specific conditions or local access for…

Is there a public PoC exploit available for CVE-2026-4958?

Yes, a public proof-of-concept exploit is available for CVE-2026-4958. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-4958?

During next maintenance window: Apply vendor patches when convenient. Monitor vendor channels for updates.

Xagent CVE-2026-4958

Q: What is the CVSS score of CVE-2026-4958?

CVE-2026-4958 has a CVSS 4.0 base score of 1.3 (Low). CVSS vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

EUVD-2026-16690 LOW

Authorization Bypass Through User-Controlled Key (CWE-639)

2026-03-27 VulDB

Authentication Bypass Xagent

1.3

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

1.3 LOW

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

CVSS changed

Apr 29, 2026 - 01:11 NVD

2.3 (LOW) 1.3 (LOW)

PoC Detected

Mar 30, 2026 - 13:26 vuln.today

Public exploit code

EUVD ID Assigned

Mar 27, 2026 - 16:00 euvd

EUVD-2026-16690

Analysis Generated

Mar 27, 2026 - 16:00 vuln.today

CVE Published

Mar 27, 2026 - 15:31 nvd

LOW 2.3

DescriptionCVE.org

A vulnerability has been found in OpenBMB XAgent 1.0.0. This affects the function ReplayServer.on_connect/ReplayServer.send_data of the file XAgentServer/application/websockets/replayer.py of the component WebSocket Endpoint. Such manipulation of the argument interaction_id leads to authorization bypass. The attack may be launched remotely. Attacks of this nature are highly complex. The exploitability is reported as difficult. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

AnalysisAI

OpenBMB XAgent 1.0.0 allows authenticated remote attackers to bypass authorization controls via manipulation of the interaction_id argument in the WebSocket ReplayServer endpoint (XAgentServer/application/websockets/replayer.py), enabling unauthorized access to replay functionality. The vulnerability requires low privileges and is difficult to exploit due to high attack complexity, but publicly available exploit code exists. …

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Vulnerability AssessmentAI

Risk Assessment	Real-world risk is low despite public exploit availability and confirmed authorization bypass. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An authenticated user with valid credentials to the XAgent WebSocket service observes or guesses another user's interaction_id (e.g., via information disclosure, sequential ID patterns, or enumeration). The attacker crafts a WebSocket ReplayServer.send_data request with the target interaction_id in the manipulation parameter, bypassing authorization checks due to insufficient validation. …
Remediation	No vendor-released patch has been identified at time of analysis; OpenBMB did not respond to early disclosure notifications. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

During next maintenance window: Apply vendor patches when convenient. …

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CVE-2026-4958 vulnerability details – vuln.today

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