CVE-2026-66713Network attack vector

Unauthenticated code execution via Tribes deserialization

Published Jul 28, 2026 · Updated Jul 28, 2026

Deserialization in Apache Axis2/Java through 2.0.0 on Tomcat allows remote attackers to execute arbitrary code through the Tribes port. Axis2ChannelListener.messageReceived accepts a crafted serialized Java object from the cluster channel and deserializes it without restricting permitted classes. Exposure requires network access to the clustering port and manually enabled Tribes clustering, which is disabled by default; successful exploitation runs code in the Axis2 process.

CVSS severity9.8
Critical
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in Apache Axis2/Java through 2.0.0 on Tomcat allows remote attackers to execute arbitrary code through the Tribes port. Axis2ChannelListener.messageReceived accepts a crafted serialized Java object from the cluster channel and deserializes it without restricting permitted classes. Exposure requires network access to the clustering port and manually enabled Tribes clustering, which is disabled by default; successful exploitation runs code in the Axis2 process.

The record

CVE
CVE-2026-66713
Published
Jul 28, 2026
Updated
Jul 28, 2026
Vendor
The Apache Software Foundation
Product
Apache Axis2/Java
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 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=0 <=2.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Axis2/Javaversion=0 <=2.0.0

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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