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NVD CRITICAL: CVE-2026-73046 — SiYuan before v3.7.4 improperly restricts excessive authentication attempts in t...

·Source: NIST NVD

Updated:

Executive Summary

SiYuan before v3.7.4 improperly restricts excessive authentication attempts in the CheckAuth() middleware. The HTTP Basic Authentication branch, which guards nearly the entire /api/* surface, accepts the workspace access code (Conf.AccessAuthCode) as the Basic Auth password but never consults the CAPTCHA/lockout gate or increments the failure counter used by the cookie/session login path. This all

Analysis

SiYuan before v3.7.4 improperly restricts excessive authentication attempts in the CheckAuth() middleware. The HTTP Basic Authentication branch, which guards nearly the entire /api/* surface, accepts the workspace access code (Conf.AccessAuthCode) as the Basic Auth password but never consults the CAPTCHA/lockout gate or increments the failure counter used by the cookie/session login path. This allows unauthenticated remote attackers to brute-force the admin access code with unlimited automated requests and obtain full RoleAdministrator access to the kernel. A secondary weakness exists because the access code is compared using a non-constant-time string comparison. CVSS Score: 9.8. Published: 2026-08-15T22:16:54.600.

Indicators of Compromise (1)

CVE (1)
CVE-2026-73046
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Aug 15, 2026. Verified by: NIST.

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