Markup injection via preserved entity-like input
Published Aug 21, 2026 · Updated Aug 21, 2026
Cross-site scripting in XmlBuilder in Joshua Nussbaum xml_builder 0.0.6 through 2.4.0 allows attackers to inject markup via XML text. XmlBuilder.generate/1 preserves ampersands before five entity-like tokens in element text and attributes instead of escaping them, so a later XML parse turns filtered text into markup. Exploitation requires attacker-controlled input, serialization, downstream parsing, and an unescaped markup-sensitive sink; the chain permits content spoofing or script execution.
Summary
What happened
Cross-site scripting in XmlBuilder in Joshua Nussbaum xml_builder 0.0.6 through 2.4.0 allows attackers to inject markup via XML text. XmlBuilder.generate/1 preserves ampersands before five entity-like tokens in element text and attributes instead of escaping them, so a later XML parse turns filtered text into markup. Exploitation requires attacker-controlled input, serialization, downstream parsing, and an unescaped markup-sensitive sink; the chain permits content spoofing or script execution.
The record
- CVE
- CVE-2026-47079
- Published
- Aug 21, 2026
- Updated
- Aug 21, 2026
- Vendor
- Joshua Nussbaum
- Product
- xml_builder
- Classifications
- CWE-838, CAPEC-120, T1059.007
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 21, 2026CVE publishedPublication date reported by the CVE source.
- Aug 21, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0.0.6 <2.4.1
- Affected versionversion=aae31e6e8ac837bcbb8afb816c0d14324b5cfe2b <c3390e2046ec297b3bb8c30d5779cdfd6508c275
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GHSA-5hjx-8g53-cmvm proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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