CVE-2026-74802

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

Score 8.2 from GitHub Security Advisory (severity: LOW) published 2026-08-17. A secondary CVSS source baseline 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.2Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

SiYuan versions before 3.7.4 contain a cross-site WebSocket hijacking vulnerability in the admin-only /ws/network/proxy endpoint that explicitly disables origin validation by setting CheckOrigin to unconditionally return true. Attackers can craft malicious webpages that establish WebSocket connections to this endpoint and direct the SiYuan kernel process to proxy arbitrary network traffic to attacker-chosen targets, enabling authenticated network pivoting through the victim's machine.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
53
EG Risk 53/100CISA SSVC

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
Severity82% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
5th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 17, 2026

Last Modified

August 28, 2026

Advisory Details (2)

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

SiYuan 3.7.3 Cross-Site WebSocket Hijacking via network proxy | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-cross-site-websocket-hijacking-via-network-proxy
github Patch Available🟡 PoC Available

Cross-Site WebSocket Hijacking on the admin-only network proxy endpoint (`/ws/network/proxy`) via explicit `CheckOrigin: true` bypass · Advisory · siyuan-note/siyuan · GitHub

Affected: 3.7.3

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-3cc2-h3v6-rqpq

Vendor Advisories for CVE-2026-74802(1)

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

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/siyuan-note/siyuan/kernel—
  • every version up to 0.0.0-20260803045322-cb67e0b4fab5: fixed in 0.0.0-20260803045322-cb67e0b4fab5
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 16× in last 7d / 93× 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 177 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-74802?
CVE-2026-74802 is a high vulnerability published on August 17, 2026. SiYuan versions before 3.7.4 contain a cross-site WebSocket hijacking vulnerability in the admin-only /ws/network/proxy endpoint that explicitly disables origin validation by setting CheckOrigin to unconditionally return true. Attackers can craft malicious webpages that establish WebSocket…
When was CVE-2026-74802 disclosed?
CVE-2026-74802 was first published on August 17, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74802 actively exploited?
CVE-2026-74802 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-74802?
CVE-2026-74802 has a CVSS base score of 8.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-74802?
A fix for CVE-2026-74802 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-74802 are linked in the Vendor Advisories panel on this page.

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