CVE-2026-92986

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-17. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

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

SiYuan before 3.8.4 renders document titles as HTML in the backlink dock tree without escaping markup characters. Attackers can set malicious titles through the rename API or crafted notebooks to execute scripts in the Electron renderer with access to child_process for command execution.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
55(Track)
EG Risk 55/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

September 17, 2026

Last Modified

September 17, 2026

Advisory Details (5)

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

SiYuan before 3.8.4 Cross-Site Scripting via Document Title | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-before-3.8.4-cross-site-scripting-via-document-title
generic

siyuan/app/src/util/Tree.ts at v3.8.3 · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/blob/v3.8.3/app/src/util/Tree.ts#L134
github Patch Available🟡 PoC Available

Stored XSS via Unsanitized Document Title in Backlink Dock Tree Renderer → Remote Code Execution · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c5h9-g2c6-fxjw
generic

GitHub - siyuan-note/siyuan: An open-source, privacy-first, self-hosted knowledge workspace where humans and AI agents work together 开源、隐私优先、自托管的知识工作空间，让人与智能体在此协作 · GitHub

https://github.com/siyuan-note/siyuan
github_commit

commit 6f093ebe50af (siyuan-note/siyuan)

Fix landed in siyuan-note/siyuan commit 6f093ebe50af — awaiting tagged release

https://github.com/siyuan-note/siyuan/commit/6f093ebe50afc503e2a8b056164293054f8509e7

Vendor Advisories for CVE-2026-92986(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 15× in last 7d / 15× 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. 2026-09-20 06:17 UTCGHSA enrichment
  2. 2026-09-19 18:43 UTCEG score recompute
  3. 2026-09-19 18:43 UTCGHSA enrichment
  4. 2026-09-19 07:08 UTCGHSA enrichment
  5. 2026-09-18 19:35 UTCEG score recompute
  6. 2026-09-18 19:35 UTCGHSA enrichment
  7. 2026-09-18 19:28 UTCEPSS rescore
  8. 2026-09-18 08:01 UTCGHSA enrichment
  9. 2026-09-17 20:27 UTCEG score recompute
  10. 2026-09-17 20:27 UTCGHSA enrichment
  11. 2026-09-17 19:30 UTCEG score recompute
  12. 2026-09-17 19:30 UTCGHSA enrichment
  13. 2026-09-17 15:23 UTCEG score recompute
  14. 2026-09-17 14:34 UTCEG score recompute
  15. 2026-09-17 14:34 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-92986?
CVE-2026-92986 is a high vulnerability published on September 17, 2026. SiYuan before 3.8.4 renders document titles as HTML in the backlink dock tree without escaping markup characters. Attackers can set malicious titles through the rename API or crafted notebooks to execute scripts in the Electron renderer with access to child_process for command execution.
When was CVE-2026-92986 disclosed?
CVE-2026-92986 was first published in the National Vulnerability Database on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-92986 actively exploited?
CVE-2026-92986 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 64.8% of all scored CVEs.
What is the CVSS score of CVE-2026-92986?
CVE-2026-92986 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-92986?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-92986, 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

Explore the affected products and dependency analysis for CVE-2026-92986

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