CVE-2026-4958Public exploitNetwork attack vector

Cross-user data disclosure via unchecked interaction identifier

Published Mar 27, 2026 · Updated Mar 27, 2026

Authorization bypass in OpenBMB XAgent 1.0.0 allows remote authenticated users to read other users' interaction histories. ReplayServer validates the connecting user's token but passes the path-supplied interaction_id to search_many_raws without checking interaction ownership. A valid account and another user's interaction ID are required; returned records can expose complete execution history and plaintext third-party API keys.

CVSS severity6.5
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in OpenBMB XAgent 1.0.0 allows remote authenticated users to read other users' interaction histories. ReplayServer validates the connecting user's token but passes the path-supplied interaction_id to search_many_raws without checking interaction ownership. A valid account and another user's interaction ID are required; returned records can expose complete execution history and plaintext third-party API keys.

The record

CVE
CVE-2026-4958
Published
Mar 27, 2026
Updated
Mar 27, 2026
Vendor
OpenBMB
Product
XAgent
Classifications
CWE-639, CWE-285, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenBMB · XAgentversion=1.0.0

Published CVSS scores

1.3VulDBCVSS: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
3.1VulDBCVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
2.1VulDBAV:N/AC:H/Au:S/C:P/I:N/A:N
3.1VulDBCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
CWE-285Improper Authorization
T1213Data from Information Repositories

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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