SiYuan - Authentication Bypass (CVE-2026-54069)
Description
SiYuan Note 3.6.5 and prior is vulnerable to authentication bypass. The CheckAuth middleware unconditionally trusted all chrome-extension:// origins, granting RoleAdministrator access without token validation to any request with a spoofed Origin header. Fixed in v3.7.0.
psychologyCrowdSec Analysis
CVE-2026-54069 is a newly identified vulnerability, but specific details regarding its nature, affected components, and potential impact have not yet been disclosed. As information becomes available, organizations should monitor official advisories to assess risk and determine appropriate mitigation steps.
CrowdSec has been tracking this vulnerability and its exploits since 24th of June 2026.
According to CrowdSec data, while opportunistic exploitation dominates, a portion of threat actors trying to exploit CVE-2026-54069 apply basic targeting methods such as port or service detection. This indicates emerging patterns of selective targeting. Data from the CrowdSec community also indicates a gradual decrease in attacks targeting CVE-2026-54069. While still present in the wild, exploitation levels have dropped noticeably week-over-week. This may signal that the vulnerability is becoming less relevant or that defenses are improving fast enough for attackers to lose interest.
Attackers exploit this vulnerability by sending requests to admin API endpoints such as /api/system/getConf with an Origin header set to a chrome-extension:// URL, bypassing authentication and gaining administrator access.
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| Event | Date |
|---|---|
| CVE Published | 2026-06-17 |
| Rule Released | 2026-06-24 |
| CrowdSec First Seen | 2026-06-25 |