CVE-2026-86712

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-08. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 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: 1%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 3.8.2 trusts the attacker-writable text/siyuan clipboard MIME type and skips sanitization in the paste handler, allowing code execution in the Node-enabled desktop renderer. Attackers can craft malicious web pages that write to the clipboard, and when pasted into SiYuan, injected scripts execute with full Node.js access through the Electron main process.

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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
52%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 10, 2026

Advisory Details (6)

Auto-updated Sep 8, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
generic

SiYuan before 3.8.2 Remote Code Execution via Clipboard | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-before-3.8.2-remote-code-execution-via-clipboard
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
generic

siyuan/app/src/protyle/util/paste.ts at v3.8.1 · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/blob/v3.8.1/app/src/protyle/util/paste.ts
github_release Patch Available

v3.8.2

Patch available: siyuan-note/siyuan v3.8.2

https://github.com/siyuan-note/siyuan/releases/tag/v3.8.2
github_commit

commit 9ce660652de2 (siyuan-note/siyuan)

Fix landed in siyuan-note/siyuan commit 9ce660652de2 — awaiting tagged release

https://github.com/siyuan-note/siyuan/commit/9ce660652de2ced26ec2d98a5a242cb0b8bb7273
github Patch Available🟡 PoC Available

Clipboard format spoofing from a web page's copy event bypasses paste sanitization and leads to remote code execution in the desktop app · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-9rr9-pxr4-gcgc

Vendor Advisories for CVE-2026-86712(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 27× in last 7d / 68× 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. 2026-09-25 06:50 UTCGHSA enrichment
  2. 2026-09-24 18:21 UTCEG score recompute
  3. 2026-09-24 18:21 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 05:44 UTCEG score recompute
  6. 2026-09-24 05:44 UTCGHSA enrichment
  7. 2026-09-23 17:54 UTCEPSS rescore
  8. 2026-09-23 17:15 UTCGHSA enrichment
  9. 2026-09-23 04:44 UTCGHSA enrichment
  10. 2026-09-22 16:15 UTCEG score recompute
  11. 2026-09-22 16:15 UTCGHSA enrichment
  12. 2026-09-22 16:01 UTCEPSS rescore
  13. 2026-09-22 03:47 UTCEG score recompute
  14. 2026-09-22 03:46 UTCGHSA enrichment
  15. 2026-09-21 21:09 UTCEPSS rescore
  16. 2026-09-21 15:16 UTCGHSA enrichment
  17. 2026-09-21 02:48 UTCEG score recompute
  18. 2026-09-21 02:48 UTCGHSA enrichment
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-20 14:19 UTCGHSA enrichment
  21. 2026-09-20 01:50 UTCEG score recompute
  22. 2026-09-20 01:50 UTCGHSA enrichment
  23. 2026-09-19 13:22 UTCGHSA enrichment
  24. 2026-09-19 00:54 UTCEG score recompute
  25. 2026-09-19 00:54 UTCGHSA enrichment
Show 43 more
  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 12:24 UTCGHSA enrichment
  3. 2026-09-17 23:56 UTCEG score recompute
  4. 2026-09-17 23:56 UTCGHSA enrichment
  5. 2026-09-17 19:32 UTCEPSS rescore
  6. 2026-09-17 10:56 UTCGHSA enrichment
  7. 2026-09-16 22:27 UTCEG score recompute
  8. 2026-09-16 22:27 UTCGHSA enrichment
  9. 2026-09-16 14:09 UTCEPSS rescore
  10. 2026-09-16 09:43 UTCEG score recompute
  11. 2026-09-16 09:43 UTCGHSA enrichment
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-15 21:14 UTCGHSA enrichment
  14. 2026-09-15 08:46 UTCEG score recompute
  15. 2026-09-15 08:46 UTCGHSA enrichment
  16. 2026-09-15 03:12 UTCEPSS rescore
  17. 2026-09-15 03:12 UTCEPSS rescore
  18. 2026-09-14 20:16 UTCGHSA enrichment
  19. 2026-09-14 07:48 UTCGHSA enrichment
  20. 2026-09-13 19:19 UTCEG score recompute
  21. 2026-09-13 19:19 UTCGHSA enrichment
  22. 2026-09-13 06:50 UTCGHSA enrichment
  23. 2026-09-12 18:21 UTCEG score recompute
  24. 2026-09-12 18:21 UTCGHSA enrichment
  25. 2026-09-12 05:53 UTCGHSA enrichment
  26. 2026-09-11 17:24 UTCEG score recompute
  27. 2026-09-11 17:24 UTCGHSA enrichment
  28. 2026-09-11 14:53 UTCEPSS rescore
  29. 2026-09-11 14:53 UTCEPSS rescore
  30. 2026-09-11 04:53 UTCGHSA enrichment
  31. 2026-09-10 16:24 UTCEG score recompute
  32. 2026-09-10 16:24 UTCGHSA enrichment
  33. 2026-09-10 15:27 UTCEG score recompute
  34. 2026-09-10 15:27 UTCGHSA enrichment
  35. 2026-09-10 11:41 UTCEG score recompute
  36. 2026-09-10 11:41 UTCGHSA enrichment
  37. 2026-09-09 23:12 UTCGHSA enrichment
  38. 2026-09-09 08:41 UTCGHSA enrichment
  39. 2026-09-08 20:12 UTCGHSA enrichment
  40. 2026-09-08 12:35 UTCEG score recompute
  41. 2026-09-08 12:34 UTCGHSA enrichment
  42. 2026-09-08 11:31 UTCEG score recompute
  43. 2026-09-08 11:30 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86712?
CVE-2026-86712 is a high vulnerability published on September 8, 2026. SiYuan before 3.8.2 trusts the attacker-writable text/siyuan clipboard MIME type and skips sanitization in the paste handler, allowing code execution in the Node-enabled desktop renderer. Attackers can craft malicious web pages that write to the clipboard, and when pasted into SiYuan, injected…
When was CVE-2026-86712 disclosed?
CVE-2026-86712 was first published in the National Vulnerability Database on September 8, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86712 actively exploited?
CVE-2026-86712 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 48.4% of all scored CVEs.
What is the CVSS score of CVE-2026-86712?
CVE-2026-86712 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-86712?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86712, 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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