Medium
Ghost before 6.20.0 File Read via URL Encoding Bypass
Type: advisorySources: OSV
Ghost versions before 6.20.0 contain a file extension filtering bypass vulnerability that allows unauthenticated attackers to read theme templates and metadata. Attackers can use URL encoding to bypass extension validation and access sensitive theme files.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-103276
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 13:11 UTC · Revision 1
Source evidence
Ghost before 6.20.0 File Read via URL Encoding Bypass
core-osv · Original sourcePublished 1 Oct 2026, 10:42 UTC
Ghost versions before 6.20.0 contain a file extension filtering bypass vulnerability that allows unauthenticated attackers to read theme templates and metadata. Attackers can use URL encoding to bypass extension validation and access sensitive theme files.
osv:CVE-2026-103276
Complete source record
{
"id": "b3c88c1de461c7d24dbcdf495e316c76fb80809c1e6569cdb0cb3d923bd98c11",
"url": "https://osv.dev/vulnerability/CVE-2026-103276",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Ghost before 6.20.0 File Read via URL Encoding Bypass",
"summary": "Ghost versions before 6.20.0 contain a file extension filtering bypass vulnerability that allows unauthenticated attackers to read theme templates and metadata. Attackers can use URL encoding to bypass extension validation and access sensitive theme files.",
"evidence": "osv:CVE-2026-103276",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-103276",
"aliases": [
"BIT-ghost-2026-103276",
"CVE-2026-103276",
"GHSA-6v8p-3jx9-8chr"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/tryghost/ghost",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "9da77c9302b617707699b3e8fb69c586648a6580"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "6.20.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"introduced": "0"
},
{
"fixed": "6.20.0"
}
],
"source": "DESCRIPTION"
}
]
}
}
],
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103276.json"
}
}
],
"modified": "2026-10-28T02:30:29.095103779Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103276.json",
"https://github.com/TryGhost/Ghost/security/advisories/GHSA-6v8p-3jx9-8chr",
"https://nvd.nist.gov/vuln/detail/CVE-2026-103276",
"https://www.vulncheck.com/advisories/ghost-before-6.20.0-file-read-via-url-encoding-bypass"
],
"provider_metadata": {
"cwe_ids": [
"CWE-173"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103276.json"
}
},
"related_cves": [
{
"value": "CVE-2026-103276",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 495703,
"published_at": "2026-10-01T10:42:13.916+00:00"
}