CVE-2026-73046

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM 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 — 3 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(medium)
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 26, 2026

Advisory Details (2)

Auto-updated Sep 16, 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 47× in last 7d / 205× 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.

Showing the most recent 100 of 250 total refreshes for this CVE.

  1. 2026-09-19 21:29 UTCGHSA enrichment
  2. 2026-09-19 17:10 UTCEG score recompute
  3. 2026-09-19 17:10 UTCGHSA enrichment
  4. 2026-09-19 12:51 UTCGHSA enrichment
  5. 2026-09-19 08:33 UTCGHSA enrichment
  6. 2026-09-19 04:14 UTCGHSA enrichment
  7. 2026-09-18 23:55 UTCGHSA enrichment
  8. 2026-09-18 19:36 UTCEG score recompute
  9. 2026-09-18 19:36 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 15:17 UTCGHSA enrichment
  12. 2026-09-18 10:59 UTCGHSA enrichment
  13. 2026-09-18 06:41 UTCGHSA enrichment
  14. 2026-09-18 02:23 UTCGHSA enrichment
  15. 2026-09-17 22:04 UTCEG score recompute
  16. 2026-09-17 22:04 UTCGHSA enrichment
  17. 2026-09-17 13:14 UTCGHSA enrichment
  18. 2026-09-17 08:06 UTCGHSA enrichment
  19. 2026-09-17 03:46 UTCGHSA enrichment
  20. 2026-09-16 23:22 UTCGHSA enrichment
  21. 2026-09-16 16:06 UTCEG score recompute
  22. 2026-09-16 16:06 UTCGHSA enrichment
  23. 2026-09-16 14:08 UTCEPSS rescore
  24. 2026-09-16 10:26 UTCGHSA enrichment
  25. 2026-09-16 06:07 UTCEG score recompute
Show 75 more
  1. 2026-09-16 06:07 UTCGHSA enrichment
  2. 2026-09-16 05:15 UTCEPSS rescore
  3. 2026-09-16 01:48 UTCGHSA enrichment
  4. 2026-09-15 21:30 UTCGHSA enrichment
  5. 2026-09-15 16:07 UTCGHSA enrichment
  6. 2026-09-15 11:48 UTCGHSA enrichment
  7. 2026-09-15 05:56 UTCEG score recompute
  8. 2026-09-15 05:56 UTCGHSA enrichment
  9. 2026-09-15 03:12 UTCEPSS rescore
  10. 2026-09-15 00:22 UTCGHSA enrichment
  11. 2026-09-14 20:03 UTCGHSA enrichment
  12. 2026-09-14 15:16 UTCGHSA enrichment
  13. 2026-09-14 10:58 UTCGHSA enrichment
  14. 2026-09-14 06:40 UTCGHSA enrichment
  15. 2026-09-14 02:21 UTCGHSA enrichment
  16. 2026-09-13 22:03 UTCGHSA enrichment
  17. 2026-09-13 17:44 UTCEG score recompute
  18. 2026-09-13 17:44 UTCGHSA enrichment
  19. 2026-09-13 13:25 UTCGHSA enrichment
  20. 2026-09-13 09:07 UTCGHSA enrichment
  21. 2026-09-13 04:49 UTCGHSA enrichment
  22. 2026-09-13 00:30 UTCGHSA enrichment
  23. 2026-09-12 20:12 UTCGHSA enrichment
  24. 2026-09-12 15:53 UTCEG score recompute
  25. 2026-09-12 15:53 UTCGHSA enrichment
  26. 2026-09-12 15:02 UTCEPSS rescore
  27. 2026-09-12 11:35 UTCGHSA enrichment
  28. 2026-09-12 06:43 UTCGHSA enrichment
  29. 2026-09-12 02:24 UTCGHSA enrichment
  30. 2026-09-11 22:05 UTCGHSA enrichment
  31. 2026-09-11 17:46 UTCEG score recompute
  32. 2026-09-11 17:46 UTCGHSA enrichment
  33. 2026-09-11 14:53 UTCEPSS rescore
  34. 2026-09-11 13:28 UTCEG score recompute
  35. 2026-09-11 13:28 UTCGHSA enrichment
  36. 2026-09-11 07:29 UTCGHSA enrichment
  37. 2026-09-11 03:10 UTCGHSA enrichment
  38. 2026-09-10 22:52 UTCGHSA enrichment
  39. 2026-09-10 18:33 UTCGHSA enrichment
  40. 2026-09-10 14:13 UTCGHSA enrichment
  41. 2026-09-10 09:55 UTCEG score recompute
  42. 2026-09-10 09:55 UTCGHSA enrichment
  43. 2026-09-10 09:35 UTCEPSS rescore
  44. 2026-09-10 05:37 UTCGHSA enrichment
  45. 2026-09-10 01:18 UTCGHSA enrichment
  46. 2026-09-09 17:18 UTCGHSA enrichment
  47. 2026-09-09 12:27 UTCGHSA enrichment
  48. 2026-09-09 08:07 UTCGHSA enrichment
  49. 2026-09-09 03:49 UTCEG score recompute
  50. 2026-09-09 03:49 UTCGHSA enrichment
  51. 2026-09-08 22:01 UTCEPSS rescore
  52. 2026-09-08 05:44 UTCGHSA enrichment
  53. 2026-09-08 00:50 UTCGHSA enrichment
  54. 2026-09-07 20:31 UTCGHSA enrichment
  55. 2026-09-07 16:13 UTCEG score recompute
  56. 2026-09-07 16:13 UTCGHSA enrichment
  57. 2026-09-07 04:59 UTCGHSA enrichment
  58. 2026-09-07 00:39 UTCGHSA enrichment
  59. 2026-09-06 19:44 UTCGHSA enrichment
  60. 2026-09-06 15:23 UTCEG score recompute
  61. 2026-09-06 15:23 UTCGHSA enrichment
  62. 2026-09-06 13:48 UTCEPSS rescore
  63. 2026-09-06 11:00 UTCGHSA enrichment
  64. 2026-09-06 06:42 UTCGHSA enrichment
  65. 2026-09-06 02:24 UTCGHSA enrichment
  66. 2026-09-05 22:06 UTCGHSA enrichment
  67. 2026-09-05 17:46 UTCEG score recompute
  68. 2026-09-05 17:46 UTCGHSA enrichment
  69. 2026-09-05 13:19 UTCGHSA enrichment
  70. 2026-09-05 08:54 UTCGHSA enrichment
  71. 2026-09-05 04:36 UTCGHSA enrichment
  72. 2026-09-05 00:16 UTCGHSA enrichment
  73. 2026-09-04 19:06 UTCGHSA enrichment
  74. 2026-09-04 14:30 UTCEG score recompute
  75. 2026-09-04 14:30 UTCGHSA enrichment

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 26, 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 63.6% 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.

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