How severe is CVE-2026-4958?

CVE-2026-4958 has a CVSS 3.x base score of 3.1, rated low severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-4958 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-4958?

CVE-2026-4958 affects Openbmb Xagent. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-4958?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-4958 have an EU (EUVD) identifier?

Yes. CVE-2026-4958 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16690.

When was CVE-2026-4958 published?

CVE-2026-4958 was published on 2026-03-27 and last updated on 2026-06-17.

CVE-2026-4958

CVE-2026-4958 is a low-severity vulnerability in Openbmb Xagent with a CVSS 3.x base score of 3.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-285.

Key facts

Severity: Low (CVSS 3.x base score 3.1)
CVSS v2: 2.1
CVSS v4: 1.3
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16690
Weakness: CWE-285
Affected product: Openbmb Xagent
Published: 2026-03-27
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-4958?: 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.
How severe is CVE-2026-4958?: CVE-2026-4958 has a CVSS 3.x base score of 3.1, rated low severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-4958 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-4958?: CVE-2026-4958 affects Openbmb Xagent. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-4958?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-4958 have an EU (EUVD) identifier?: Yes. CVE-2026-4958 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16690.
When was CVE-2026-4958 published?: CVE-2026-4958 was published on 2026-03-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:openbmb:xagent:1.0.0:*:*:*:*:*:*:*

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CVE-2026-4959 — High (CVSS 7.3): A vulnerability was found in OpenBMB XAgent 1.0.0. This impacts the function check_user of the file…
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