CVE-2026-82649

HIGHPre-NVD 7.07.0—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1%, top 98% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this weekElevated
7.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.0Exploit: Elevated riskExposed: 0

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

SiYuan Windows installer before version 3.8.1 (affected versions >= 2.0.14) contains an uncontrolled search path element vulnerability in its NSIS installer, which invokes system executables such as TASKKILL by name rather than by absolute path. Because NSIS nsExec::Exec resolves these calls using a search path that includes the installer's own launch directory ahead of System32, an attacker who plants a malicious executable (e.g., a renamed TASKKILL.exe) in that directory can have it executed when the installer runs. These calls occur in electron-builder's preInit hook before the license page is displayed, and with an all-users (elevated) install the planted binary executes with an elevated token, resulting in local privilege escalation.

CVSS v3
7.0
EG Score
7.0(medium)
EG Risk
63(Attend)
EG Risk 63/100SSVC: 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
Severity70% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

August 30, 2026

Last Modified

September 1, 2026

Advisory Details (3)

Auto-updated Aug 30, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
generic

SiYuan before 3.8.1 Local Privilege Escalation via Uncontrolled Search Path | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-before-3.8.1-local-privilege-escalation-via-uncontrolled-search-path
github_commit

commit 251596fc0de2 (siyuan-note/siyuan)

Fix landed in siyuan-note/siyuan commit 251596fc0de2 — awaiting tagged release

https://github.com/siyuan-note/siyuan/commit/251596fc0de2f9528c00c224252fd073a99973f4
github Patch Available🟡 PoC Available

Uncontrolled Search Path Elements in SiYuan installer lead to Local Privilege Escalation · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-9j65-967f-5rv3

Vendor Advisories for CVE-2026-82649(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 24× in last 7d / 75× 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 15:22 UTCGHSA enrichment
  2. 2026-09-20 02:01 UTCEG score recompute
  3. 2026-09-20 02:01 UTCGHSA enrichment
  4. 2026-09-19 12:49 UTCGHSA enrichment
  5. 2026-09-18 23:37 UTCEG score recompute
  6. 2026-09-18 23:37 UTCGHSA enrichment
  7. 2026-09-18 19:28 UTCEPSS rescore
  8. 2026-09-18 10:25 UTCGHSA enrichment
  9. 2026-09-17 21:13 UTCEG score recompute
  10. 2026-09-17 21:13 UTCGHSA enrichment
  11. 2026-09-17 08:01 UTCGHSA enrichment
  12. 2026-09-16 18:49 UTCEG score recompute
  13. 2026-09-16 18:48 UTCGHSA enrichment
  14. 2026-09-16 14:08 UTCEPSS rescore
  15. 2026-09-16 05:15 UTCEPSS rescore
  16. 2026-09-16 03:16 UTCGHSA enrichment
  17. 2026-09-15 14:04 UTCEG score recompute
  18. 2026-09-15 14:04 UTCGHSA enrichment
  19. 2026-09-15 03:12 UTCEPSS rescore
  20. 2026-09-15 03:12 UTCEPSS rescore
  21. 2026-09-15 00:51 UTCGHSA enrichment
  22. 2026-09-14 11:39 UTCGHSA enrichment
  23. 2026-09-13 22:27 UTCEG score recompute
  24. 2026-09-13 22:27 UTCGHSA enrichment
  25. 2026-09-13 09:15 UTCGHSA enrichment
Show 50 more
  1. 2026-09-12 20:03 UTCEG score recompute
  2. 2026-09-12 20:03 UTCGHSA enrichment
  3. 2026-09-12 06:51 UTCGHSA enrichment
  4. 2026-09-11 17:39 UTCEG score recompute
  5. 2026-09-11 17:39 UTCGHSA enrichment
  6. 2026-09-11 14:53 UTCEPSS rescore
  7. 2026-09-11 14:53 UTCEPSS rescore
  8. 2026-09-11 04:27 UTCGHSA enrichment
  9. 2026-09-10 15:15 UTCEG score recompute
  10. 2026-09-10 15:15 UTCGHSA enrichment
  11. 2026-09-10 02:02 UTCGHSA enrichment
  12. 2026-09-09 12:49 UTCGHSA enrichment
  13. 2026-09-08 23:36 UTCEG score recompute
  14. 2026-09-08 23:36 UTCGHSA enrichment
  15. 2026-09-08 22:01 UTCEPSS rescore
  16. 2026-09-08 08:22 UTCGHSA enrichment
  17. 2026-09-07 19:07 UTCEG score recompute
  18. 2026-09-07 19:07 UTCGHSA enrichment
  19. 2026-09-07 05:54 UTCGHSA enrichment
  20. 2026-09-06 16:43 UTCEG score recompute
  21. 2026-09-06 16:43 UTCGHSA enrichment
  22. 2026-09-06 13:48 UTCEPSS rescore
  23. 2026-09-06 03:31 UTCGHSA enrichment
  24. 2026-09-05 14:17 UTCGHSA enrichment
  25. 2026-09-05 01:03 UTCEG score recompute
  26. 2026-09-05 01:03 UTCGHSA enrichment
  27. 2026-09-04 11:51 UTCEG score recompute
  28. 2026-09-04 11:51 UTCGHSA enrichment
  29. 2026-09-04 05:07 UTCEPSS rescore
  30. 2026-09-03 22:38 UTCGHSA enrichment
  31. 2026-09-03 09:26 UTCGHSA enrichment
  32. 2026-09-02 20:13 UTCEG score recompute
  33. 2026-09-02 20:13 UTCGHSA enrichment
  34. 2026-09-02 14:12 UTCEPSS rescore
  35. 2026-09-02 05:11 UTCGHSA enrichment
  36. 2026-09-01 15:57 UTCEG score recompute
  37. 2026-09-01 15:57 UTCGHSA enrichment
  38. 2026-09-01 14:29 UTCEG score recompute
  39. 2026-09-01 14:29 UTCGHSA enrichment
  40. 2026-09-01 13:54 UTCEPSS rescore
  41. 2026-09-01 10:22 UTCEG score recompute
  42. 2026-09-01 10:22 UTCGHSA enrichment
  43. 2026-09-01 04:40 UTCEPSS rescore
  44. 2026-09-01 04:40 UTCEPSS rescore
  45. 2026-08-31 21:08 UTCGHSA enrichment
  46. 2026-08-31 17:44 UTCGHSA enrichment
  47. 2026-08-31 04:30 UTCGHSA enrichment
  48. 2026-08-30 15:18 UTCEG score recompute
  49. 2026-08-30 14:37 UTCEG score recompute
  50. 2026-08-30 14:34 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-82649?
CVE-2026-82649 is a high vulnerability published on August 30, 2026. SiYuan Windows installer before version 3.8.1 (affected versions >= 2.0.14) contains an uncontrolled search path element vulnerability in its NSIS installer, which invokes system executables such as TASKKILL by name rather than by absolute path. Because NSIS nsExec::Exec resolves these calls using…
When was CVE-2026-82649 disclosed?
CVE-2026-82649 was first published in the National Vulnerability Database on August 30, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82649 actively exploited?
CVE-2026-82649 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 97.8% of all scored CVEs.
What is the CVSS score of CVE-2026-82649?
CVE-2026-82649 has a CVSS v3 base score of 7.0 (NVD).
How do I remediate CVE-2026-82649?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82649, 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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