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Fencer Intel
medium 5.5

CVE-2018-8026 json

XML external entity expansion in org.apache.solr:solr-core

published 2018-07-05 8 y ago modified 2026-06-17 4 mo ago also GHSA-7px3-6f6g-hxcj , EUVD-2018-0539

cvss
5.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
9.0%
EPSS 9.0% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

This vulnerability in Apache Solr 6.0.0 to 6.6.4 and 7.0.0 to 7.3.1 relates to an XML external entity expansion (XXE) in Solr config files (currency.xml, enumsConfig.xml referred from schema.xml, TIKA parsecontext config file). In addition, Xinclude functionality provided in these config files is also affected in a similar way. The vulnerability can be used as XXE using file/ftp/http protocols in order to read arbitrary local files from the Solr server or the internal network. The manipulated files can be uploaded as configsets using Solr's API, allowing to exploit that vulnerability.

Patch / fix

  • maven org.apache.solr:solr-core 6.6.5, 7.4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-8026 updated cvss 6.5

solr: XML external entity expansion in config files allows for arbitrary file read

  • Red Hat JBoss Developer Studio 11 solr solr Red Hat Fuse 7 camel-solr camel-solr Red Hat JBoss Data Grid 6 solr-core Red Hat JBoss Data Virtualization 6 solr-core Red Hat JBoss Enterprise Application Platform 6 solr-core Red Hat JBoss Fuse 6 solr-core
    +2 more products
    Red Hat JBoss Fuse Service Works 6 solr-core Red Hat Virtualization 4 eap7-lucene-solr
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

9.03% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • issues.apache.org https://issues.apache.org/jira/browse/SOLR-12450 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 5.5 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N
GitHub 3.0 5.5 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
maven org.apache.solr:solr-core
>=7.0.0, <7.4.0
>=6.0.0, <6.6.5
7.4.0
6.6.5

Affected products

  • Apache Software Foundation Apache Solr

Classification

Weakness
  • CWE-611 Improper Restriction of XML External Entity Reference

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.