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CVE-2026-47898

MEDIUM 4

Published 2026-07-03 · Last modified 2026-07-06

Improper Restriction of XML External Entity Reference vulnerability in Apache Lucene.Net (Lucene.Net.Analysis.Common library). This issue affects Apache Lucene.Net.Analysis.Common: from 4.8.0-beta00005 before 4.8.0-beta00018. Users are recommended to upgrade to version 4.8.0-beta00018, which fixes the issue.

NO EXPLOITATION SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.3%chance of exploitation in 30 days · 25th percentile

○ In CISA KEV ○ Public exploit / PoC

Impact if exploited

4CVSS 4.0 · MEDIUM

  • ConfidentialityLow
  • IntegrityNone
  • AvailabilityNone

What an attacker needs

  • ⚠Access: Requires local access to the host
  • ⚠Privileges: Requires an admin / high-privilege account
  • ✓User interaction: No user interaction needed
  • ⚠Complexity: Needs a race window or specific setup
  • ✓Requirements: No special attack requirements

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

Test against your own equipment

curl -s https://vulnpedia.com/cve/CVE-2026-47898/poc.jsonMachine-readable PoC index for this CVE (for automation).

Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-47898/poc.json

Affected

Vendors Apache Software Foundation Apache

Products Apache Lucene.Net Lucene.Net

Weakness (CWE)

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

CVSS vector

CVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:N/SA:N

Known Affected Software Configurations

VendorProductVersion range
ApacheLucene.Net4.8.0
ApacheLucene.Net4.8.0
ApacheLucene.Net4.8.0
ApacheLucene.Net4.8.0
ApacheLucene.Net4.8.0
ApacheLucene.Net4.8.0
ApacheLucene.Net4.8.0
ApacheLucene.Net4.8.0
ApacheLucene.Net4.8.0
ApacheLucene.Net4.8.0
ApacheLucene.Net4.8.0
ApacheLucene.Net4.8.0
ApacheLucene.Net4.8.0

All CVSS metrics

  • MEDIUM 4 v4.0 · CNA Primary
    CVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:N/SA:N
  • MEDIUM 4 v4.0 · NVD Secondary
    CVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  • CRITICAL 9.8 v3.1 · NVD Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Advisories

Sources: NVD · CVE.org · EPSS