CVE-2026-34449 is a critical Remote Code Execution (RCE) vulnerability affecting SiYuan personal knowledge management systems prior to version 3.6.2. Rated 9.6 Critical (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H), this flaw stems from a permissive CORS policy that allows a malicious website to inject JavaScript. This injected code executes with full OS access within Electron's Node.js context the next time the user opens SiYuan's UI. The attack requires a user to visit a malicious website while SiYuan is running, but no further interaction is needed. Currently, there are no known public exploits or evidence of active exploitation, though the vulnerability has received some community attention.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 3.6.2CPE matchmatch criteria | cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.8 Bluesky, 0.5 Mastodon, and 1.2 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.