CVE-2026-73054

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-16. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

SiYuan versions before v3.7.4 contain an authentication bypass vulnerability in the WebSocket endpoint caused by differential parsing of query parameters between authentication exemption and session quarantine checks. Unauthenticated attackers can craft a malicious WebSocket URI with duplicated query parameters to bypass access auth code validation and receive the live kernel event stream including document identifiers, titles, and operation logs.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
65(Attend)
EG Risk 65/100SSVC: 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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 17, 2026

Advisory Details (2)

Auto-updated Aug 15, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

SiYuan before v3.7.4 Authentication Bypass via WebSocket | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-websocket
github Patch Available🟡 PoC Available

A parser differential between the WebSocket keepalive exemption and the session quarantine allows unauthenticated access to the broadcast event stream, defeating the fix for GHSA-xp2m-98x8-rpj6 · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c8w8-3pqp-wr83

Vendor Advisories for CVE-2026-73054(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 29× in last 7d / 29× 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. 2026-08-21 01:06 UTCEG score recompute
  2. 2026-08-21 01:06 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 14:02 UTCGHSA enrichment
  5. 2026-08-20 02:24 UTCEG score recompute
  6. 2026-08-20 02:24 UTCGHSA enrichment
  7. 2026-08-19 17:04 UTCEPSS rescore
  8. 2026-08-19 15:20 UTCGHSA enrichment
  9. 2026-08-19 04:06 UTCGHSA enrichment
  10. 2026-08-18 16:59 UTCEG score recompute
  11. 2026-08-18 16:59 UTCGHSA enrichment
  12. 2026-08-18 13:49 UTCEPSS rescore
  13. 2026-08-18 13:49 UTCEPSS rescore
  14. 2026-08-18 05:37 UTCGHSA enrichment
  15. 2026-08-17 18:33 UTCEG score recompute
  16. 2026-08-17 18:33 UTCGHSA enrichment
  17. 2026-08-17 17:30 UTCEG score recompute
  18. 2026-08-17 17:30 UTCGHSA enrichment
  19. 2026-08-17 13:47 UTCEPSS rescore
  20. 2026-08-17 07:38 UTCGHSA enrichment
  21. 2026-08-16 20:35 UTCEG score recompute
  22. 2026-08-16 20:35 UTCGHSA enrichment
  23. 2026-08-16 14:56 UTCEPSS rescore
  24. 2026-08-16 14:56 UTCEPSS rescore
  25. 2026-08-16 09:32 UTCEG score recompute
Show 4 more
  1. 2026-08-16 09:32 UTCGHSA enrichment
  2. 2026-08-15 22:29 UTCEG score recompute
  3. 2026-08-15 21:53 UTCEG score recompute
  4. 2026-08-15 21:52 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-73054?
CVE-2026-73054 is a high vulnerability published on August 15, 2026. SiYuan versions before v3.7.4 contain an authentication bypass vulnerability in the WebSocket endpoint caused by differential parsing of query parameters between authentication exemption and session quarantine checks. Unauthenticated attackers can craft a malicious WebSocket URI with duplicated…
When was CVE-2026-73054 disclosed?
CVE-2026-73054 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-2026-73054 actively exploited?
CVE-2026-73054 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 75.8% of all scored CVEs.
What is the CVSS score of CVE-2026-73054?
CVE-2026-73054 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-73054?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73054, 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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