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/.
{
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82651.json",
"cwe_ids": [
"CWE-200"
]
}{
"extracted_events": [
{
"introduced": "0"
},
{
"fixed": "3.8.1"
},
{
"fixed": "v3.8.1"
}
],
"source": [
"AFFECTED_FIELD",
"DESCRIPTION"
]
}