CVE-2026-74902

HIGHPre-NVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

Score 8.6 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-18. A secondary CVSS source baseline 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.6Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

SiYuan before v3.7.4 contains a cross-site scripting vulnerability in the file upload validation flow that fails to escape filenames before inserting them into HTML via insertAdjacentHTML. Attackers can craft a malicious filename containing script payloads that execute with full OS command access when a user drags, drops, or pastes the file into the editor.

CVSS v3
8.6
EG Score
8.6HIGHmedium confidence
EG Risk
39
EG Risk 39/100CISA SSVC

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
Severity86% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
8th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 18, 2026

Last Modified

August 26, 2026

Advisory Details (2)

Auto-updated Aug 18, 2026
Patch available. Sources: github.
generic

SiYuan before v3.7.4 XSS-to-RCE via malicious filename upload | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-before-xss-to-rce-via-malicious-filename-upload
github Patch Available

XSS-to-RCE via malicious filename in the upload/drag-drop validation flow (app/src/protyle/upload/index.ts), reflected unescaped into showMessage's insertAdjacentHTML sink · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-jf56-jrhq-j2qp

Vendor Advisories for CVE-2026-74902(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 21× in last 7d / 95× 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.

Showing the most recent 100 of 168 total refreshes for this CVE.

  1. 2026-10-05 11:50 UTCEG score recompute
  2. 2026-10-05 11:50 UTCGHSA enrichment
  3. 2026-10-04 23:22 UTCEPSS rescore
  4. 2026-10-04 21:46 UTCGHSA enrichment
  5. 2026-10-04 06:18 UTCGHSA enrichment
  6. 2026-10-03 17:44 UTCEG score recompute
  7. 2026-10-03 17:44 UTCGHSA enrichment
  8. 2026-10-03 14:26 UTCEPSS rescore
  9. 2026-10-02 15:43 UTCGHSA enrichment
  10. 2026-10-02 01:33 UTCEG score recompute
  11. 2026-10-02 01:32 UTCGHSA enrichment
  12. 2026-10-01 19:50 UTCEPSS rescore
  13. 2026-10-01 11:10 UTCGHSA enrichment
  14. 2026-09-30 22:34 UTCEG score recompute
  15. 2026-09-30 22:34 UTCGHSA enrichment
  16. 2026-09-30 09:55 UTCEG score recompute
  17. 2026-09-30 09:55 UTCGHSA enrichment
  18. 2026-09-29 15:24 UTCEPSS rescore
  19. 2026-09-28 23:32 UTCEG score recompute
  20. 2026-09-28 23:32 UTCGHSA enrichment
  21. 2026-09-28 13:52 UTCEPSS rescore
  22. 2026-09-28 10:11 UTCGHSA enrichment
  23. 2026-09-27 21:37 UTCEG score recompute
  24. 2026-09-27 21:36 UTCGHSA enrichment
  25. 2026-09-27 13:48 UTCEPSS rescore
Show 75 more
  1. 2026-09-27 08:03 UTCEG score recompute
  2. 2026-09-27 08:03 UTCGHSA enrichment
  3. 2026-09-26 15:59 UTCEPSS rescore
  4. 2026-09-26 00:28 UTCEPSS rescore
  5. 2026-09-25 01:44 UTCEG score recompute
  6. 2026-09-25 01:44 UTCGHSA enrichment
  7. 2026-09-24 14:04 UTCEPSS rescore
  8. 2026-09-24 10:17 UTCGHSA enrichment
  9. 2026-09-23 21:43 UTCEG score recompute
  10. 2026-09-23 21:43 UTCGHSA enrichment
  11. 2026-09-23 17:54 UTCEPSS rescore
  12. 2026-09-23 09:10 UTCGHSA enrichment
  13. 2026-09-22 20:36 UTCEG score recompute
  14. 2026-09-22 20:36 UTCGHSA enrichment
  15. 2026-09-22 16:01 UTCEPSS rescore
  16. 2026-09-22 04:26 UTCEG score recompute
  17. 2026-09-22 04:26 UTCGHSA enrichment
  18. 2026-09-21 21:09 UTCEPSS rescore
  19. 2026-09-21 15:51 UTCGHSA enrichment
  20. 2026-09-21 02:51 UTCEG score recompute
  21. 2026-09-21 02:51 UTCGHSA enrichment
  22. 2026-09-20 20:16 UTCEPSS rescore
  23. 2026-09-20 14:11 UTCGHSA enrichment
  24. 2026-09-20 00:34 UTCEG score recompute
  25. 2026-09-20 00:34 UTCGHSA enrichment
  26. 2026-09-19 11:59 UTCGHSA enrichment
  27. 2026-09-18 23:00 UTCEG score recompute
  28. 2026-09-18 23:00 UTCGHSA enrichment
  29. 2026-09-18 19:28 UTCEPSS rescore
  30. 2026-09-18 10:27 UTCGHSA enrichment
  31. 2026-09-17 21:53 UTCEG score recompute
  32. 2026-09-17 21:53 UTCGHSA enrichment
  33. 2026-09-17 03:47 UTCGHSA enrichment
  34. 2026-09-16 15:13 UTCEG score recompute
  35. 2026-09-16 15:13 UTCGHSA enrichment
  36. 2026-09-16 14:08 UTCEPSS rescore
  37. 2026-09-16 05:15 UTCEPSS rescore
  38. 2026-09-16 01:31 UTCGHSA enrichment
  39. 2026-09-15 12:57 UTCEG score recompute
  40. 2026-09-15 12:57 UTCGHSA enrichment
  41. 2026-09-15 03:12 UTCEPSS rescore
  42. 2026-09-15 00:08 UTCGHSA enrichment
  43. 2026-09-14 10:25 UTCGHSA enrichment
  44. 2026-09-13 21:51 UTCEG score recompute
  45. 2026-09-13 21:51 UTCGHSA enrichment
  46. 2026-09-13 09:16 UTCGHSA enrichment
  47. 2026-09-12 20:43 UTCGHSA enrichment
  48. 2026-09-12 08:09 UTCGHSA enrichment
  49. 2026-09-11 19:35 UTCEG score recompute
  50. 2026-09-11 19:35 UTCGHSA enrichment
  51. 2026-09-11 14:53 UTCEPSS rescore
  52. 2026-09-11 07:01 UTCGHSA enrichment
  53. 2026-09-10 18:27 UTCEG score recompute
  54. 2026-09-10 18:27 UTCGHSA enrichment
  55. 2026-09-10 09:35 UTCEPSS rescore
  56. 2026-09-10 05:48 UTCGHSA enrichment
  57. 2026-09-09 17:14 UTCGHSA enrichment
  58. 2026-09-09 03:33 UTCEG score recompute
  59. 2026-09-09 03:33 UTCGHSA enrichment
  60. 2026-09-08 22:01 UTCEPSS rescore
  61. 2026-09-08 08:28 UTCGHSA enrichment
  62. 2026-09-07 19:43 UTCEG score recompute
  63. 2026-09-07 19:43 UTCGHSA enrichment
  64. 2026-09-07 07:09 UTCGHSA enrichment
  65. 2026-09-06 18:11 UTCEG score recompute
  66. 2026-09-06 18:10 UTCGHSA enrichment
  67. 2026-09-06 13:48 UTCEPSS rescore
  68. 2026-09-06 05:33 UTCGHSA enrichment
  69. 2026-09-05 17:00 UTCEG score recompute
  70. 2026-09-05 17:00 UTCGHSA enrichment
  71. 2026-09-05 04:14 UTCGHSA enrichment
  72. 2026-09-04 15:39 UTCEG score recompute
  73. 2026-09-04 15:39 UTCGHSA enrichment
  74. 2026-09-04 05:07 UTCEPSS rescore
  75. 2026-09-04 03:01 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2026-74902?
CVE-2026-74902 is a high vulnerability published on August 18, 2026. SiYuan before v3.7.4 contains a cross-site scripting vulnerability in the file upload validation flow that fails to escape filenames before inserting them into HTML via insertAdjacentHTML. Attackers can craft a malicious filename containing script payloads that execute with full OS command access…
When was CVE-2026-74902 disclosed?
CVE-2026-74902 was first published on August 18, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74902 actively exploited?
CVE-2026-74902 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (8th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-74902?
CVE-2026-74902 has a CVSS base score of 8.6 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-74902?
A fix for CVE-2026-74902 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-74902 are linked in the Vendor Advisories panel on this page.

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