CVE-2026-62204 SiYuan before v3.7.4 Plugin Overwrite via Bazaar Install
Attackers can overwrite trusted plugins via mismatched package names in SiYuan, enabling persistent code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-62204?
CVE-2026-62204 is a medium-severity missing authorization vulnerability in siyuan-note siyuan, published on 22 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
SiYuan versions before v3.7.4 fail to validate that packageName matches the downloaded package content in bazaar install endpoints. Attackers with same-origin access can overwrite existing trusted plugins by supplying mismatched packageName and repoURL parameters, achieving persistence across application restarts.
Weakness: CWE-345
Which versions are affected by CVE-2026-62204?
2 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 | 0.0.0-20260808010544-26ccb40d390e |
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260808010544-26ccb40d390e |
How do I fix CVE-2026-62204?
Upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260808010544-26ccb40d390e or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-62204 being exploited?
There is no known exploitation of CVE-2026-62204 in the wild and no public exploit code.
Sources
Also known as GHSA-rpx2-p6hp-x5gj.