CVE-2026-83607 (GCVE-0-2026-83607)
Vulnerability from cvelistv5 – Published: 2026-09-01 14:23 – Updated: 2026-09-01 15:28
VLAI
EPSS
VEX
Title
xmldom: Element name injection via createElement() bypasses requireWellFormed
Summary
xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.14 and 0.9.11, and in xmldom version 0.6.0 and earlier, Document.createElement(tagName) stores an unvalidated element name and XMLSerializer.serializeToString() emits that name verbatim. The requireWellFormed: true path did not validate the element qualified name or synthesized xmlns:PREFIX declaration, so attacker-controlled tag names could inject attributes, elements, or processing instructions into serialized XML or HTML and could cause cross-site scripting when browser-consumed. The unchecked values violate the XML QName constraint, and default serialization and creation-time createElement() behavior remain permissive. This issue is fixed in @xmldom/xmldom versions 0.8.14 and 0.9.11; no fixed version is available for xmldom.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-01 15:28 UTC
CWE
- CWE-91 - XML Injection (aka Blind XPath Injection)
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/xmldom/xmldom/security/advisor… | x_refsource_CONFIRM |
| https://github.com/xmldom/xmldom/pull/1043 | x_refsource_MISC |
| https://github.com/xmldom/xmldom/pull/1050 | x_refsource_MISC |
| https://github.com/xmldom/xmldom/commit/cba132121… | x_refsource_MISC |
| https://github.com/xmldom/xmldom/commit/d8212e632… | x_refsource_MISC |
| https://github.com/xmldom/xmldom/releases/tag/0.8.14 | x_refsource_MISC |
| https://github.com/xmldom/xmldom/releases/tag/0.9.11 | x_refsource_MISC |
Impacted products
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{
"name": "https://github.com/xmldom/xmldom/commit/cba1321218b069182695813fa7565653708e172e",
"tags": [
"x_refsource_MISC"
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"url": "https://github.com/xmldom/xmldom/commit/cba1321218b069182695813fa7565653708e172e"
},
{
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"x_refsource_MISC"
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"url": "https://github.com/xmldom/xmldom/commit/d8212e632507eaf1d9f609657dd4c56abeb12d44"
},
{
"name": "https://github.com/xmldom/xmldom/releases/tag/0.8.14",
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"url": "https://github.com/xmldom/xmldom/releases/tag/0.9.11"
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"source": {
"advisory": "GHSA-w2rr-34g9-rvrj",
"discovery": "UNKNOWN"
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"title": "xmldom: Element name injection via createElement() bypasses requireWellFormed"
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"redhat_vex": {
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"id": "CVE-2026-83607",
"initial_release_date": "2026-09-01T14:23:58.797000+00:00",
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"source": "Red Hat CSAF VEX",
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"title": "xmldom: xmldom: Cross-site scripting via unvalidated element name injection",
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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