CVE-2026-4958: A vulnerability has been found in OpenBMB XAgent 1.0.0

Routine

LOW 3.1DOWNGRADE

CVE-2026-4958 is a low-severity flaw (CVSS 3.1) affecting xagent. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 bee

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	3.1 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-285, CWE-639
Published	2026-03-27
Last modified	2026-10-26

Publisher (CNA): VulDB · Vendor: openbmb

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-27 16:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

openbmb xagent DOWNGRADE

Affected: 1.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy xagent || rpm -q xagent || xagent --version

2. No fixed release: DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison xagent sudo apt install xagent=<VERSION_BEFORE_1.0.0> sudo apt-mark hold xagent

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list xagent sudo dnf downgrade xagent-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add xagent

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-4958?

xagent: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-4958 being exploited?

CVE-2026-4958 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-4958 affect?

CVE-2026-4958 affects xagent. Severity is low (CVSS 3.1). 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 manipulat

How urgent is CVE-2026-4958?

Priority 24/100. Public exploit reference

Related CVEs

CVE-2026-4957 LOW 2.7 DOWNGRADE A flaw has been found in OpenBMB XAgent 1.0.0
CVE-2026-4959 HIGH 7.3 DOWNGRADE A vulnerability was found in OpenBMB XAgent 1.0.0

References

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