Is CVE-2026-72812 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-72812 being exploited in the wild.

How severe is CVE-2026-72812?

Medium severity, with a CVSS score of 6.5, published 3 September 2026.

Which products and versions are affected?

github.com/siyuan-note/siyuan/kernel (Go) < 0.0.0-20260723002528-7d273c271ce1, SEMVER:introduced=0,fixed=0.0.0-20260723002528-7d273c271ce1.

Is there a fix for CVE-2026-72812?

Yes. github.com/siyuan-note/siyuan/kernel (Go): upgrade to 0.0.0-20260723002528-7d273c271ce1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-72812 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-72812?

Check whether you run github.com/siyuan-note/siyuan/kernel (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-72812: SiYuan missing authorization in refreshBacklink endpoint

Q: Is there a fix for CVE-2026-72812?

Yes. github.com/siyuan-note/siyuan/kernel (Go): upgrade to 0.0.0-20260723002528-7d273c271ce1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-72812 attacked?

It is attacked over the network, in a web application.

Q: Am I affected by CVE-2026-72812?

Check whether you run github.com/siyuan-note/siyuan/kernel (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-72812 · Severity: medium · CVSS 6.5 · Published 2026-09-03

SiYuan is a note-taking application with a publish feature that allows users to share documents. An unauthenticated user or low-privileged reader can call the `/api/ref/refreshBacklink` endpoint in publish mode to trigger persistent writes to the server's database, bypassing read-only protections and causing resource exhaustion. This allows attackers to perform denial-of-service attacks and violate the integrity of the application's invariants without needing credentials.

Technologies: github.com/siyuan-note/siyuan/kernel (Go). Vendors: Go.

Quick answers

Is CVE-2026-72812 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-72812 being exploited in the wild.
How severe is CVE-2026-72812?: Medium severity, with a CVSS score of 6.5, published 3 September 2026.
Which products and versions are affected?: github.com/siyuan-note/siyuan/kernel (Go) < 0.0.0-20260723002528-7d273c271ce1, SEMVER:introduced=0,fixed=0.0.0-20260723002528-7d273c271ce1.
Is there a fix for CVE-2026-72812?: Yes. github.com/siyuan-note/siyuan/kernel (Go): upgrade to 0.0.0-20260723002528-7d273c271ce1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-72812 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-72812?: Check whether you run github.com/siyuan-note/siyuan/kernel (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

github.com/siyuan-note/siyuan/kernel (Go): upgrade to 0.0.0-20260723002528-7d273c271ce1 or later
```
go get github.com/siyuan-note/siyuan/kernel@v0.0.0-20260723002528-7d273c271ce1
```

Technical details

The `/api/ref/refreshBacklink` endpoint is a POST handler that lacks proper authorization guards. Unlike similar mutating endpoints that enforce `CheckAdminRole`, `CheckReadonly`, or inline `IsReadOnlyRoleContext` checks, this endpoint only requires `CheckAuth`, which admits reader-role users and anonymous accounts when publish mode authentication is disabled. When called, the handler invokes `model.RefreshBacklink(id)`, which executes a full write chain: flushing the transaction queue, performing global reference scans, loading and parsing trees from disk, and enqueuing database writes. The endpoint does not honor the global `util.ReadOnly` flag and accepts attacker-controlled block IDs without per-object publish-access validation, allowing readers to reindex documents outside their scope. This is reachable over the network with no authentication required in default publish configurations.

Affected products

SiYuan SiYuan before 0.0.0-20260723002528-7d273c271ce1

Identifiers

CVE-2026-72812
GHSA-wgwx-479j-23vq
GO-2026-6408

Timeline

2026-07-23: disclosed: Initially published to GitHub Advisory Database
2026-09-03: advisory: Advisory updated with full details
2026-07-23: patched: Patched in commit 7d273c271ce1

References

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