CVE-2026-40023

mediumpriority · track · 21EPSS 0.005 · 43 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.50% (43rd) EPSS

CVSS 5.3 · medium

Is it mine?

16 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

6.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 1.7–6.3

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v4.06.3mediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:Nsecondary · ENISA EU

v4.06.3mediumCVSS: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:Xsecondary · security@apache.org

v4.01.7lowCVSS: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:U/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:Xsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-116US

affected products (16)

Products and version ranges known to be affected.

HCL Dominoall versionscert_bundDEcpe:/a:hcltech:domino:-
IBM App Connect Enterpriseall versionscert_bundDEcpe:/a:ibm:app_connect_enterprise:-
IBM Business Automation Workflowall versionscert_bundDEcpe:/a:ibm:business_automation_workflow:-
IBM DB2all versionscert_bundDEcpe:/a:ibm:db2:-
IBM License Metric Toolall versionscert_bundDEcpe:/a:ibm:license_metric_tool:-
IBM Operational Decision Managerall versionscert_bundDEcpe:/a:ibm:operational_decision_manager:-
IBM SPSSall versionscert_bundDEcpe:/a:ibm:spss:modeler
IBM Tivoli Netcool/OMNIbusall versionscert_bundDEcpe:/a:ibm:tivoli_netcool%2fomnibus:-
IBM Tivoli Network Managerall versionscert_bundDEcpe:/a:ibm:tivoli_network_manager:-
Apache Log4cxx< 1.7.0cert_bundDE
IBM QRadar SIEM< 7.5.0 UP16cert_bundDE
IBM QRadar SIEM< 7.6.0 FP 3cert_bundDE
Apache Software Foundation Apache Log4cxx0 → 1.7.0enisa_euvdEU
Apache Software Foundation Apache Log4cxx (Brew)0 → 1.7.0enisa_euvdEU
Apache Software Foundation Apache Log4cxx (Conan)0 → 1.7.0enisa_euvdEU
apache log4cxx< 1.7.0nvdUScpe:2.3:a:apache:log4cxx:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-2292Apache log4j und Log4cxx: Mehrere Schwachstellen ermöglichen Manipulation von DateienDeutsch2026-07-12csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Apache log4j und Apache Log4cxx ausnutzen, um Dateien zu manipulieren.

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd NVD CVE.org MITRE

published 2026-04-10modified 2026-10-26

references (18)

External citations — patches, advisories, analysis.

scry

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