CVE-2026-4958

OpenBMB XAgent WebSocket Endpoint replayer.py ReplayServer.send_data authorization

MEDIUM
6.5
CVSS Score
Published: March 27, 2026 at 03:31 PM UTC
Updated: October 26, 2026 at 10:10 PM UTC
1 product affected across 1 vendorXAgent

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.4%
SSVC
PoC

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

VDB EntryTechnical DescriptionPermissions Required
Source: cverecord
https://vuldb.com/?id.353835
SignaturePermissions RequiredVDB Entry
Source: cverecord
https://vuldb.com/?ctiid.353835
Third Party AdvisoryIssue Tracking
Source: cverecord
https://vuldb.com/?submit.777618

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-639CWE-285

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