CVE-2026-75916

HIGHPre-NVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

Score 8.6 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-19. 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 weekElevated
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: Elevated riskExposed services: Not assessed

A fix is available — apply it.

SiYuan through 3.7.3 contains a cross-site scripting vulnerability in the '((' block-reference autocomplete hint popup. In genHintItemHTML() (app/src/protyle/hint/extend.ts), a candidate block's name, alias, and memo fields are concatenated into the popup's HTML without escaping. An attacker who can set these metadata fields on a block can inject a self-firing payload (e.g. ) that executes automatically when a victim types '((' followed by a search term that surfaces the crafted block. Because SiYuan's Electron windows run with nodeIntegration enabled, contextIsolation disabled, and no CSP, the injected script gains require('child_process') access, allowing the XSS to escalate to arbitrary OS command execution.

CVSS v3
8.6
EG Score
8.6HIGHmedium confidence
EG Risk
55
EG Risk 55/100CISA 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%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.2%
EPSS %ILE
14th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. 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). 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 19, 2026

Last Modified

August 26, 2026

Advisory Details (2)

Auto-updated Aug 19, 2026
Patch available. Sources: github.
generic

SiYuan XSS-to-RCE via unescaped block metadata in hint popup | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-xss-to-rce-via-unescaped-block-metadata-in-hint-popup
github Patch Available

Zero-click XSS-to-RCE via unescaped block name/alias/memo in the "((" block-reference autocomplete hint popup (app/src/protyle/hint/extend.ts), fires on render with no user interaction beyond typing a reference · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5prr-vgxq-69g9

Vendor Advisories for CVE-2026-75916(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 23× in last 7d / 103× 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 176 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-75916?
CVE-2026-75916 is a high vulnerability published on August 19, 2026. SiYuan through 3.7.3 contains a cross-site scripting vulnerability in the '((' block-reference autocomplete hint popup. In genHintItemHTML() (app/src/protyle/hint/extend.ts), a candidate block's name, alias, and memo fields are concatenated into the popup's HTML without escaping. An attacker who…
When was CVE-2026-75916 disclosed?
CVE-2026-75916 was first published on August 19, 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-2026-75916 actively exploited?
CVE-2026-75916 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (14th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-75916?
CVE-2026-75916 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-2026-75916?
A fix for CVE-2026-75916 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-75916 are linked in the Vendor Advisories panel on this page.

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