CVE-2026-48590 PUBLISHED

Element and Attribute Names Injected Verbatim into XML Output in xml_builder

Assigner: EEF
Reserved: 22.05.2026 Published: 21.08.2026 Updated: 21.08.2026

XML Injection vulnerability in joshnuss xml_builder (XmlBuilder module) allows Content Spoofing, XML Injection.

This vulnerability is associated with program files lib/xml_builder.ex and program routines XmlBuilder.generate/1, XmlBuilder.generate/2, XmlBuilder.element/1, XmlBuilder.element/2, XmlBuilder.element/3.

Element names, attribute names, and doctype identifiers are interpolated verbatim into the serialized XML output without validation or escaping of structural characters (<, >, ", ', &). An attacker who can influence a name argument (for example, an element name derived from a JSON object key or an HTTP form field name) can inject arbitrary XML markup including extra elements, comments, and event-handler attributes into the output document.

This issue affects xml_builder: from 0.0.1 before 2.4.1.

Metrics

CVSS Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
CVSS Score: 2.1

Product Status

Vendor joshnuss
Product xml_builder
Versions Default: unaffected
  • affected from 0.0.1 to 2.4.1 (excl.)
Vendor joshnuss
Product xml_builder
Versions Default: unaffected
  • affected from 9fb49131ad3ee146a4c9db9bc175bdffe32e30a0 to d5c0aec32a8eecbb440fb9bbb0f59d4d188d5859 (excl.)

Credits

  • Peter Ullrich finder
  • Joshua Nussbaum remediation developer
  • Jonatan Männchen / EEF coordinator

References

Problem Types

  • CWE-91 XML Injection (aka Blind XPath Injection) CWE

Impacts

  • CAPEC-250 XML Injection