Medium
SiYuan before v3.8.1 Missing Authorization via /history and /repo/diff
Type: advisorySources: OSV
SiYuan before v3.8.1 does not apply the IsForbiddenAbsPath guard (introduced in GHSA-c8r8-95hg-mp34) to the /history/*path and /repo/diff/*path endpoints in kernel/server/serve.go. These routes require admin authentication but construct file paths independently, so an authenticated administrator can retrieve historical snapshots of sensitive files that the guard is meant to block, including data/.siyuan/publishAccess.json (plaintext publish-mode passwords) and files under data/templates/.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-82651
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 16:37 UTC · Revision 1
Source evidence
SiYuan before v3.8.1 Missing Authorization via /history and /repo/diff
core-osv · Original sourcePublished 30 Aug 2026, 14:33 UTC
SiYuan before v3.8.1 does not apply the IsForbiddenAbsPath guard (introduced in GHSA-c8r8-95hg-mp34) to the /history/*path and /repo/diff/*path endpoints in kernel/server/serve.go. These routes require admin authentication but construct file paths independently, so an authenticated administrator can retrieve historical snapshots of sensitive files that the guard is meant to block, including data/.siyuan/publishAccess.json (plaintext publish-mode passwords) and files under data/templates/.
osv:CVE-2026-82651
Complete source record
{
"id": "d5e88bd304662758b582913d34806e41e4a857ad2c9080172eb9150b21e6003f",
"url": "https://osv.dev/vulnerability/CVE-2026-82651",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "SiYuan before v3.8.1 Missing Authorization via /history and /repo/diff",
"summary": "SiYuan before v3.8.1 does not apply the IsForbiddenAbsPath guard (introduced in GHSA-c8r8-95hg-mp34) to the /history/*path and /repo/diff/*path endpoints in kernel/server/serve.go. These routes require admin authentication but construct file paths independently, so an authenticated administrator can retrieve historical snapshots of sensitive files that the guard is meant to block, including data/.siyuan/publishAccess.json (plaintext publish-mode passwords) and files under data/templates/.",
"evidence": "osv:CVE-2026-82651",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-82651",
"aliases": [
"CVE-2026-82651",
"GHSA-3cm4-ccvw-6xr6",
"GO-2026-6662"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/siyuan-note/siyuan",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "afa823b6b4e4f183511e0bc0a3be93caa94c7c97"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "3.8.1"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"introduced": "0"
},
{
"fixed": "3.8.1"
}
],
"source": "DESCRIPTION"
}
]
}
}
],
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82651.json"
}
}
],
"modified": "2026-10-28T02:30:21.070482854Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82651.json",
"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-3cm4-ccvw-6xr6",
"https://nvd.nist.gov/vuln/detail/CVE-2026-82651",
"https://www.vulncheck.com/advisories/siyuan-before-3.8.1-missing-authorization-via-history-and-repo-diff"
],
"provider_metadata": {
"cwe_ids": [
"CWE-200"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82651.json"
}
},
"related_cves": [
{
"value": "CVE-2026-82651",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 487257,
"published_at": "2026-08-30T14:33:33.112+00:00"
}