CVE WatchAug 30, 2026

CVE-2026-82651

SiYuan before v3.8.1 does not apply the IsForbiddenAbsPath guard (introduced in GHSA-c8r8-95hg-mp34) to the /history/*path and /repo/diff/*p

CVSS

4.9

Medium

EPSS

—

KEV

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Exploit Today

0-100

Published: Aug 30, 2026 · Last modified: Aug 30, 2026 · CWE-200

EPSS · 30d

Not enough EPSS history yet.

Technical description

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/.

Official references

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