CVE-2026-68586 SiYuan before v3.7.3 Content Disclosure via getBacklinkDoc
Attackers can bypass publish filters to read restricted document content via unfiltered API endpoints in SiYuan.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-68586?
CVE-2026-68586 is a critical missing authorization vulnerability in siyuan-note siyuan, published on 3 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
SiYuan before v3.7.3 fails to apply publish-access filters to the getBacklinkDoc and getBackmentionDoc content endpoints (/api/ref/getBacklinkDoc and /api/ref/getBackmentionDoc). While the corresponding backlink list endpoints filter publish-forbidden documents, the content endpoints (gated only by CheckAuth) do not. A publish-mode reader — including an anonymous reader when publish Basic Auth is disabled — can call these endpoints directly with a publish-forbidden document's ID to retrieve its rendered DOM content and to determine whether the document references a given block (a reference-existence oracle).
Weakness: CWE-862
Which versions are affected by CVE-2026-68586?
3 open source packages ship an affected version, including github.com/siyuan-note/siyuan/kernel.
| Package | Affected | Fixed in |
|---|---|---|
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260721014413-f45749a7ef6e |
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260721014413-f45749a7ef6e |
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260721014413-f45749a7ef6e |
How do I fix CVE-2026-68586?
Upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260721014413-f45749a7ef6e or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-68586 being exploited?
There is no known exploitation of CVE-2026-68586 in the wild and no public exploit code.
Sources
Also known as GHSA-36v8-mpjm-8j5r, GO-2026-6379.