Medium
Grav: Stored CSS injection via Markdown image ?style=… reaches MediaObjectTrait::style()
Type: advisorySources: OSV
Grav is a file-based Web platform. Prior to 2.0.0-rc.9, Grav's incomplete fix for stored XSS through the Markdown media attribute action (CVE-2026-42841) leaves the sibling MediaObjectTrait::style method reachable through the same Markdown excerpt-action pipeline, allowing an editor to save Markdown image style parameters that are written into the rendered img style attribute without sanitization. This issue is fixed in version 2.0.0-rc.9.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-55890
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 01:23 UTC · Revision 1
Source evidence
Grav: Stored CSS injection via Markdown image ?style=… reaches MediaObjectTrait::style()
core-osv · Original sourcePublished 10 Jul 2026, 16:17 UTC
Grav is a file-based Web platform. Prior to 2.0.0-rc.9, Grav's incomplete fix for stored XSS through the Markdown media attribute action (CVE-2026-42841) leaves the sibling MediaObjectTrait::style method reachable through the same Markdown excerpt-action pipeline, allowing an editor to save Markdown image style parameters that are written into the rendered img style attribute without sanitization. This issue is fixed in version 2.0.0-rc.9.
osv:CVE-2026-55890
Complete source record
{
"id": "16f9ccc4dd5f0df6b114b09c4a3c96ef8733ec22f83f9f127b1e5b67fe406fbe",
"url": "https://osv.dev/vulnerability/CVE-2026-55890",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Grav: Stored CSS injection via Markdown image ?style=… reaches MediaObjectTrait::style()",
"summary": "Grav is a file-based Web platform. Prior to 2.0.0-rc.9, Grav's incomplete fix for stored XSS through the Markdown media attribute action (CVE-2026-42841) leaves the sibling MediaObjectTrait::style method reachable through the same Markdown excerpt-action pipeline, allowing an editor to save Markdown image style parameters that are written into the rendered img style attribute without sanitization. This issue is fixed in version 2.0.0-rc.9.",
"evidence": "osv:CVE-2026-55890",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-55890",
"aliases": [
"CVE-2026-55890",
"GHSA-pmf8-g7c8-7v54"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/getgrav/grav",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "e03d29aa0d3ece16d73c1ffccfa78df8bf5f28b8"
},
{
"fixed": "24fd6cbc438e12310b126d1176e7d7601203a6f2"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "2.0.0-rc.9"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "24fd6cbc438e12310b126d1176e7d7601203a6f2"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "e03d29aa0d3ece16d73c1ffccfa78df8bf5f28b8"
}
],
"source": "REFERENCES_TAG",
"original_tag": "2.0.0-rc.9"
}
]
}
}
],
"versions": [
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55890.json"
}
}
],
"modified": "2026-10-28T02:30:24.752244201Z",
"provider": "osv",
"references": [
"https://github.com/getgrav/grav/releases/tag/2.0.0-rc.9",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55890.json",
"https://github.com/getgrav/grav/security/advisories/GHSA-pmf8-g7c8-7v54",
"https://nvd.nist.gov/vuln/detail/CVE-2026-55890",
"https://github.com/getgrav/grav/commit/24fd6cbc438e12310b126d1176e7d7601203a6f2"
],
"provider_metadata": {
"cwe_ids": [
"CWE-79"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55890.json"
}
},
"related_cves": [
{
"value": "CVE-2026-55890",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 491558,
"published_at": "2026-07-10T16:17:14.238+00:00"
}