CVE-2026-74802

HIGHPre-NVD 8.28.2—
EchelonGraph scoreHIGH 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 — 4 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%CVSS: 8.2Exploit: Elevated riskExposed: 0

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

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
8.2(high)
EG Risk
53(Track)
EG Risk 53/100SSVC: Track

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%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
1%
KEV
Not listed

Published

August 17, 2026

Last Modified

August 17, 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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 19× 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 22:56 UTCEPSS rescore
  2. 2026-08-20 20:15 UTCGHSA enrichment
  3. 2026-08-20 07:58 UTCGHSA enrichment
  4. 2026-08-19 19:41 UTCEG score recompute
  5. 2026-08-19 19:41 UTCGHSA enrichment
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-19 07:23 UTCGHSA enrichment
  8. 2026-08-18 19:07 UTCEG score recompute
  9. 2026-08-18 19:07 UTCGHSA enrichment
  10. 2026-08-18 13:49 UTCEPSS rescore
  11. 2026-08-18 13:49 UTCEPSS rescore
  12. 2026-08-18 06:49 UTCGHSA enrichment
  13. 2026-08-17 18:31 UTCEG score recompute
  14. 2026-08-17 18:31 UTCGHSA enrichment
  15. 2026-08-17 18:11 UTCEG score recompute
  16. 2026-08-17 18:11 UTCGHSA enrichment
  17. 2026-08-17 11:42 UTCEG score recompute
  18. 2026-08-17 11:13 UTCEG score recompute
  19. 2026-08-17 11:12 UTCMITRE cvelistV5first tracked

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 in the National Vulnerability Database 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-2026-74802 actively exploited?
CVE-2026-74802 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 98.8% of all scored CVEs.
What is the CVSS score of CVE-2026-74802?
CVE-2026-74802 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-74802?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74802, 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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