CVE-2026-93921 SiYuan through 3.8.4 Access Control Bypass via Dynamic Icon Endpoint
Attackers with read-only tokens can bypass access controls to read restricted document metadata via the dynamic icon endpoint.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-93921?
CVE-2026-93921 is a medium-severity missing authorization vulnerability in siyuan-note siyuan, published on 18 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
SiYuan versions through 3.8.4 fail to enforce publish access control in the getDynamicIcon endpoint, allowing read-only token holders to access document metadata. Attackers can call the endpoint with type=8 and crafted content to read block titles, names, aliases, and hierarchical paths of restricted documents via template injection.
Weakness: CWE-862
Which versions are affected by CVE-2026-93921?
How do I fix CVE-2026-93921?
No fix has been published for CVE-2026-93921 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-93921 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-93921 exists.
Sources
Also known as GHSA-j5v6-qhh5-48r7, GHSA-whcx-xxqh-c838.