CVE-2026-82651CWE-200information-disclosure

CVE-2026-82651

Medium · published August 30, 2026

CVSS v3.1
4.9
EPSS
0%
Percentile
40.2
In the wild
Unconfirmed
What it is

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/.

The record
Technical detail
CVSS v3.1
4.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
6.9 · 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
EPSS
0.00477 · 40.2th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2026-08-30T19:16Z
References (2)
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-3cm4-ccvw-6xr6 · [email protected]https://www.vulncheck.com/advisories/siyuan-before-3.8.1-missing-authorization-via-history-and-repo-diff · [email protected]
EPSS history
Timeline
  • 01 SEP 03:32Z
    EPSS moved — → 0%
    epss
  • 30 AUG 14:33Z
    SiYuan before v3.8.1 Missing Authorization via /history and /repo/diff
    cvelistv5