CVE-2026-73631Network attack vectorHinoki check available

Cross-request data disclosure via shared JSON parser

Published Aug 15, 2026 · Updated Aug 15, 2026

Shared-state data exposure in Apache Struts 7.2.1 allows remote attackers to observe data from concurrent JSON requests. The JSON interceptor reuses a stateful StrutsJSONReader across threads, so one parse can expose another request's values and disrupt limit counters. Exposure requires the JSON plugin, a reachable action populated from JSON request bodies, and concurrent requests; action population is not enabled by default.

CVSS severityUnavailable
Unscored
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Shared-state data exposure in Apache Struts 7.2.1 allows remote attackers to observe data from concurrent JSON requests. The JSON interceptor reuses a stateful StrutsJSONReader across threads, so one parse can expose another request's values and disrupt limit counters. Exposure requires the JSON plugin, a reachable action populated from JSON request bodies, and concurrent requests; action population is not enabled by default.

The record

CVE
CVE-2026-73631
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Apache Software Foundation
Product
Apache Struts
Classifications
CWE-567
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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?

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  1. Affected versionversion=7.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Apache Software Foundation · Apache Strutsversion=7.2.1

Published CVSS scores

No CVSS assessment is available in this record.

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-567Unsynchronized Access to Shared Data in a Multithreaded Context

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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