CVE-2026-40322

CRITICALNVD 9.09.0
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This critical-severity CVE scores 9.0 under NVD CVSS v3. EPSS exploit probability: 0.5% (43rd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Trending — 3 sources updated this weekElevated
9.0EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.0Exploit: No code on recordExposed services: Not assessed

The CVE record names the fixed release — apply it.

SiYuan is an open-source personal knowledge management system. In versions 3.6.3 and below, Mermaid diagrams are rendered with securityLevel set to "loose", and the resulting SVG is injected into the DOM via innerHTML. This allows attacker-controlled javascript: URLs in Mermaid code blocks to survive into the rendered output. On desktop builds using Electron, windows are created with nodeIntegration enabled and contextIsolation disabled, escalating the stored XSS to arbitrary code execution when a victim opens a note containing a malicious Mermaid block and clicks the rendered diagram node. This issue has been fixed in version 3.6.4.

CVSS v3
9.0
EG Score
9.0CRITICALmedium confidence
EG Risk
57
EG Risk 57/100

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 (value × EchelonGraph’s weight)
Severity90% × 45%
The EG Score, 9.0 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
43rd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

April 16, 2026

Last Modified

April 20, 2026

Advisory Details (2)

Auto-updated May 20, 2026
Fix named in the CVE record. Sources: github.
GitHub advisoryMentions a patch (unverified)

SiYuan Mermaid `javascript:` Link Injection Leads to Stored XSS and Electron RCE · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-x63q-3rcj-hhp5
Web page

Release Improve details · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/releases/tag/v3.6.4

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 16× in last 7d / 32× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 95 of 181 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 5 repeat rows among the latest 100 are merged into the row they repeat. The 86 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-16 19:06 UTCEG score recompute
  2. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  3. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  4. 2026-10-15 16:18 UTCEG score recompute
  5. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  6. 2026-10-14 10:23 UTCEG score recompute
  7. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  8. 2026-10-13 08:55 UTCEG score recompute
  9. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  10. 2026-10-12 16:09 UTCEG score recompute
  11. 2026-10-11 19:51 UTCEG score recompute
  12. 2026-10-11 17:05 UTCEG score recompute
  13. 2026-10-11 14:31 UTCEG score recompute
  14. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  15. 2026-10-11 05:55 UTCOSV refresh
  16. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  17. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  18. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  19. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  20. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  21. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  22. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  23. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  24. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  25. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
Show 70 more
  1. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  2. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  3. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  4. 2026-09-21 17:49 UTCOSV refresh
  5. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  6. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  7. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  8. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  9. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  10. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  11. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  12. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  13. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  14. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  15. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  16. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  17. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  18. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  19. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  20. 2026-09-02 14:31 UTCOSV refresh
  21. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  22. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  23. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  24. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  25. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  26. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  27. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  28. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  29. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  30. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  31. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  32. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  33. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  34. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  35. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  36. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  37. 2026-08-16 06:34 UTCEG score recompute
  38. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  39. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  40. 2026-08-14 04:39 UTCEG score recompute
  41. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  42. 2026-08-12 18:50 UTCEG score recompute
  43. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  44. 2026-08-11 16:59 UTCEG score recompute
  45. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  46. 2026-08-11 02:35 UTCEG score recompute
  47. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  48. 2026-08-09 16:31 UTCEG score recompute
  49. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  50. 2026-08-09 03:56 UTCEG score recompute
  51. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  52. 2026-08-07 17:07 UTCEG score recompute
  53. 2026-08-06 17:28 UTCEG score recompute
  54. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  55. 2026-08-05 23:20 UTCEG score recompute
  56. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  57. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  58. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  59. 2026-08-03 21:32 UTCEG score recompute
  60. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  61. 2026-08-02 13:09 UTCEG score recompute
  62. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  63. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  64. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  65. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  66. 2026-07-27 14:13 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  67. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  68. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  69. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  70. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.3% · 22nd percentile

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Frequently asked(5)

What is CVE-2026-40322?
CVE-2026-40322 is a critical-severity vulnerability; its CVE record was published on April 16, 2026. SiYuan is an open-source personal knowledge management system. In versions 3.6.3 and below, Mermaid diagrams are rendered with securityLevel set to "loose", and the resulting SVG is injected into the DOM via innerHTML. This allows attacker-controlled javascript: URLs in Mermaid code blocks to…
When was the CVE record for CVE-2026-40322 published?
The CVE record for CVE-2026-40322 was published on April 16, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of April 20, 2026; the record at its source may have been updated since.
Is CVE-2026-40322 actively exploited?
CVE-2026-40322 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-40322?
CVE-2026-40322 has a CVSS v3 base score of 9.0 (NVD).
How do I remediate CVE-2026-40322?
The CVE record for CVE-2026-40322 names the fix: "This issue has been fixed in version 3.6.4."

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