CVE-2026-56397

CRITICALPre-NVD 9.69.6—
EchelonGraph scoreHIGH confidence

Score 9.6 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-21. a secondary CVSS source baseline 9.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.6Exploit: NoneExposed: 0

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

SiYuan before v3.6.1 fails to sanitize package metadata and README content in the Bazaar marketplace, allowing malicious package authors to inject arbitrary HTML and JavaScript. Attackers can achieve remote code execution on any user browsing the Bazaar by embedding XSS payloads in package displayName, description, or README fields, exploiting Electron's nodeIntegration setting to execute OS commands.

CVSS v3
9.6
EG Score
9.6(high)
EPSS
31.1%
KEV
Not listed

Published

June 21, 2026

Last Modified

June 24, 2026

Advisory Details (2)

Auto-updated Jun 22, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

SiYuan - Remote Code Execution via Malicious Bazaar Package Metadata and README | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-remote-code-execution-via-malicious-bazaar-package-metadata-and-readme-2
github Patch Available🟡 PoC Available

Remote Code Execution via Malicious Bazaar Package — Marketplace XSS · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-v3mg-9v85-fcm7

Vendor Advisories for CVE-2026-56397(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 86× in last 7d / 193× 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 193 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-56397?
CVE-2026-56397 is a critical vulnerability published on June 21, 2026. SiYuan before v3.6.1 fails to sanitize package metadata and README content in the Bazaar marketplace, allowing malicious package authors to inject arbitrary HTML and JavaScript. Attackers can achieve remote code execution on any user browsing the Bazaar by embedding XSS payloads in package…
When was CVE-2026-56397 disclosed?
CVE-2026-56397 was first published in the National Vulnerability Database on June 21, 2026, with the most recent update on June 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56397 actively exploited?
CVE-2026-56397 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 31.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56397?
CVE-2026-56397 has a CVSS v3 base score of 9.6 (NVD).
How do I remediate CVE-2026-56397?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56397, 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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