CVE-2026-73056

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 kernel versions before 3.7.4 contain an improper restriction of excessive authentication attempts vulnerability in the CheckAuth() middleware. The middleware accepts the API token (Conf.Api.Token) via an Authorization header (Token/Bearer) or a ?token= query parameter, and neither path is protected by the application's CAPTCHA/lockout mechanism (NeedCaptcha/WrongAuthCount). As a result, an unauthenticated remote attacker can perform unlimited automated guesses of the API token, particularly when a short or weak custom token has been configured, and upon success gains full RoleAdministrator access enabling arbitrary file operations and SQL queries.

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
38%
KEV
Not listed

Published

August 16, 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

Unthrottled brute-force of `Conf.Api.Token` via header/query auth in `CheckAuth()`, allowing unlimited automated guessing of a weakened API admin token · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-m6w6-p7pc-fpg2
generic

SiYuan kernel before 3.7.4 Unthrottled Brute-Force via API Token | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-kernel-before-unthrottled-brute-force-via-api-token

Vendor Advisories for CVE-2026-73056(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 51× in last 7d / 222× 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 263 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-73056?
CVE-2026-73056 is a critical vulnerability published on August 16, 2026. SiYuan kernel versions before 3.7.4 contain an improper restriction of excessive authentication attempts vulnerability in the CheckAuth() middleware. The middleware accepts the API token (Conf.Api.Token) via an Authorization header (Token/Bearer) or a ?token= query parameter, and neither path is…
When was CVE-2026-73056 disclosed?
CVE-2026-73056 was first published in the National Vulnerability Database on August 16, 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-2026-73056 actively exploited?
CVE-2026-73056 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 61.6% of all scored CVEs.
What is the CVSS score of CVE-2026-73056?
CVE-2026-73056 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-73056?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73056, 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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