CVE-2026-34480

What is CVE-2026-34480?

In summary,

Apache Log4j Core's XmlLayout, in versions up to and including 2.25.3, fails to sanitize characters forbidden by the XML 1.0 specification producing invalid XML output whenever a log message or MDC value contains such characters. The impact depends on the StAX implementation in use: * JRE built-in StAX: Forbidden characters are silently written to the output, producing malformed XML. Conforming parsers must reject such documents with a fatal error, which may cause downstream log-processing systems to drop the affected records. * Alternative StAX implementations (e.g., Woodstox https://github.com/FasterXML/woodstox , a transitive dependency of the Jackson XML Dataformat module): An exception is thrown during the logging call, and the log event is never delivered to its intended appender, only to Log4j's internal status logger. Users are advised to upgrade to Apache Log4j Core 2.25.4, which corrects this issue by sanitizing forbidden characters before XML output.

National Vulnerability Database (CVE-2026-34480)

Is Cascade CMS affected by CVE-2026-34480?

After review, it has been determined that Cascade CMS is not affected by CVE-2026-34480 as the attack vector relies on an implementation of Log4j that is not utilized in the application. 

~4/29/2026 3:03pm ET