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Apache CVE-2026-40023

| EUVD-2026-21490 MEDIUM
Improper Encoding or Escaping of Output (CWE-116)
2026-04-10 apache
Apache Information Disclosure
6.3
CVSS 4.0
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CVSS VectorNVD

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/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
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
EUVD ID Assigned
Apr 10, 2026 - 16:00 euvd
EUVD-2026-21490
Analysis Generated
Apr 10, 2026 - 16:00 vuln.today
Patch released
Apr 10, 2026 - 16:00 nvd
Patch available
CVE Published
Apr 10, 2026 - 15:45 nvd
MEDIUM 6.3

DescriptionNVD

Apache Log4cxx's XMLLayout https://logging.apache.org/log4cxx/1.7.0/classlog4cxx_1_1xml_1_1XMLLayout.html , in versions before 1.7.0, fails to sanitize characters forbidden by the XML 1.0 specification https://www.w3.org/TR/xml/#charsets in log messages, NDC, and MDC property keys and values, producing invalid XML output. Conforming XML parsers must reject such documents with a fatal error, which may cause downstream log processing systems to drop or fail to index affected records.

An attacker who can influence logged data can exploit this to suppress individual log records, impairing audit trails and detection of malicious activity.

Users are advised to upgrade to Apache Log4cxx 1.7.0, which fixes this issue.

AnalysisAI

Apache Log4cxx XMLLayout before version 1.7.0 fails to sanitize XML-forbidden characters in log messages, NDC (Nested Diagnostic Context), and MDC (Mapped Diagnostic Context) properties, producing malformed XML that conforming parsers reject with fatal errors. Attackers who can influence logged data can exploit this to suppress individual log records, degrading audit trails and impairing detection of malicious activity. …

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CVE-2026-40023 vulnerability details – vuln.today
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