CVE-2026-47897Network attack vector

Arbitrary file write via unvalidated replication filenames

Published Jul 3, 2026 · Updated Jul 3, 2026

Path traversal in Apache Lucene.NET Replicator before 4.8.0-beta00018 allows remote attackers to write arbitrary files on clients. SessionToken(IDataInput) accepts server-supplied RevisionFile names, which reach client filesystem paths without single-component validation. Exploitation requires replication from a malicious or compromised server; traversal sequences redirect writes outside the replication directory.

CVSS severity8.9
High
EPSS probability0.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Apache Lucene.NET Replicator before 4.8.0-beta00018 allows remote attackers to write arbitrary files on clients. SessionToken(IDataInput) accepts server-supplied RevisionFile names, which reach client filesystem paths without single-component validation. Exploitation requires replication from a malicious or compromised server; traversal sequences redirect writes outside the replication directory.

The record

CVE
CVE-2026-47897
Published
Jul 3, 2026
Updated
Jul 3, 2026
Vendor
The Apache Software Foundation
Product
Apache Lucene.NET
Classifications
CWE-22
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 3, 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=4.8.0-beta00005 <4.8.0-beta00018

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Lucene.NETversion=4.8.0-beta00005 <4.8.0-beta00018

Published CVSS scores

8.9Apache Software FoundationCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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.

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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-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

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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