CVE-2026-74868 SiYuan before 3.7.4 Brute-Force Authentication via Publish Service
Attackers can brute-force Basic Auth credentials on the default Publish Service port to access published notes without rate limiting.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-74868?
CVE-2026-74868 is a high-severity authentication bypass vulnerability in siyuan-note siyuan, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
SiYuan versions before 3.7.4 contain an unthrottled brute-force vulnerability in the Publish Service Basic Auth implementation (PublishServiceTransport.RoundTrip() in kernel/server/proxy/publish.go). The Publish Service runs on a separate, unauthenticated-by-default listener (default TCP port 6808) and gates named publish-viewer accounts (Conf.Publish.Auth.Accounts) with Basic Auth that has no rate limiting, per-account lockout, or backoff. Unauthenticated remote attackers can submit unlimited password guesses against named accounts to gain access to published notes/notebooks.
Weakness: CWE-307
Which versions are affected by CVE-2026-74868?
How do I fix CVE-2026-74868?
No fix has been published for CVE-2026-74868 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-74868 being exploited?
There is no known exploitation of CVE-2026-74868 in the wild and no public exploit code.
Sources
Also known as GHSA-r2rg-wg48-xwhx.