Astro is a web framework for content-driven websites. Prior to 7.4.5, Astro rendered a string used as a dynamic element name as raw HTML after applying an incomplete character filter. A / in the string could make an HTML parser treat the remainder as attributes, allowing untrusted element-name input to inject event-handler markup. The .astro dynamic-tag renderer, JSX renderer, and MDX renderer were affected, and exploitation required an application to use request-controlled or stored untrusted data as all or part of an element name. This issue is fixed in version 7.4.5.
{
"cna_assigner": "GitHub_M",
"cwe_ids": [
"CWE-184",
"CWE-79"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126361.json"
}{
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "7.4.5"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "e023abac912d7cb6af2b9fb5107ef5dabc667096"
}
],
"source": "REFERENCES_COMMIT"
},
{
"original_tag": "astro@7.4.5",
"range": [
{
"fixed": "d354ffba8df77ab9d89480bb5d0ca6efe249573e"
}
],
"source": "REFERENCES_TAG"
}
]
}