CVE-2026-73046

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-16. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
9.8
EG Score
9.8(high)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
36%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 17, 2026

Advisory Details (2)

Auto-updated Aug 17, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

HTTP Basic Auth path in CheckAuth() bypasses the workspace access-code CAPTCHA/lockout, allowing unthrottled remote brute-force of the admin credential · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-w3xh-mmmh-r54v
generic

SiYuan before v3.7.4 Authentication Bypass via HTTP Basic Auth | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-http-basic-auth

Vendor Advisories for CVE-2026-73046(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 43× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-20 12:32 UTCGHSA enrichment
  2. 2026-08-20 08:14 UTCGHSA enrichment
  3. 2026-08-20 03:56 UTCGHSA enrichment
  4. 2026-08-19 23:37 UTCGHSA enrichment
  5. 2026-08-19 19:17 UTCEG score recompute
  6. 2026-08-19 19:17 UTCGHSA enrichment
  7. 2026-08-19 17:04 UTCEPSS rescore
  8. 2026-08-19 14:58 UTCGHSA enrichment
  9. 2026-08-19 10:40 UTCGHSA enrichment
  10. 2026-08-19 06:19 UTCGHSA enrichment
  11. 2026-08-19 01:55 UTCGHSA enrichment
  12. 2026-08-18 21:37 UTCGHSA enrichment
  13. 2026-08-18 16:59 UTCEG score recompute
  14. 2026-08-18 16:59 UTCGHSA enrichment
  15. 2026-08-18 13:49 UTCEPSS rescore
  16. 2026-08-18 13:49 UTCEPSS rescore
  17. 2026-08-18 11:52 UTCGHSA enrichment
  18. 2026-08-18 07:33 UTCGHSA enrichment
  19. 2026-08-18 03:13 UTCGHSA enrichment
  20. 2026-08-17 22:52 UTCGHSA enrichment
  21. 2026-08-17 18:34 UTCEG score recompute
  22. 2026-08-17 18:33 UTCGHSA enrichment
  23. 2026-08-17 17:49 UTCEG score recompute
  24. 2026-08-17 17:49 UTCGHSA enrichment
  25. 2026-08-17 17:33 UTCEG score recompute
Show 18 more
  1. 2026-08-17 17:33 UTCGHSA enrichment
  2. 2026-08-17 13:47 UTCEPSS rescore
  3. 2026-08-17 13:14 UTCGHSA enrichment
  4. 2026-08-17 08:56 UTCGHSA enrichment
  5. 2026-08-17 04:38 UTCGHSA enrichment
  6. 2026-08-17 00:19 UTCGHSA enrichment
  7. 2026-08-16 20:01 UTCGHSA enrichment
  8. 2026-08-16 15:42 UTCEG score recompute
  9. 2026-08-16 15:42 UTCGHSA enrichment
  10. 2026-08-16 14:56 UTCEPSS rescore
  11. 2026-08-16 14:56 UTCEPSS rescore
  12. 2026-08-16 11:23 UTCGHSA enrichment
  13. 2026-08-16 07:05 UTCGHSA enrichment
  14. 2026-08-16 02:47 UTCEG score recompute
  15. 2026-08-16 02:47 UTCGHSA enrichment
  16. 2026-08-15 22:29 UTCEG score recompute
  17. 2026-08-15 21:53 UTCEG score recompute
  18. 2026-08-15 21:52 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-73046?
CVE-2026-73046 is a critical vulnerability published on August 15, 2026. 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…
When was CVE-2026-73046 disclosed?
CVE-2026-73046 was first published in the National Vulnerability Database on August 15, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73046 actively exploited?
CVE-2026-73046 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 64.3% of all scored CVEs.
What is the CVSS score of CVE-2026-73046?
CVE-2026-73046 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-73046?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73046, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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