CVE-2026-50733

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-05. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

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

Markdown Preview Enhanced before 0.8.28 parses WaveDrom diagrams by evaluating untrusted markdown content with eval(), allowing arbitrary JavaScript execution. The flaw affects every render path - the live preview (window.eval) and presentation mode plus HTML export (the bundled WaveDrom.ProcessAll()/eva() helpers) - and can also be triggered through a element injected via raw HTML in markdown. When a victim previews or exports a crafted markdown document, an attacker can execute arbitrary code, leading to arbitrary file write. Fixed in 0.8.28 by parsing with JSON5.parse() and sanitizing WaveDrom data scripts to inert strict JSON.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
56(Track*)
EG Risk 56/100SSVC: Track*

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
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS
28.7%
KEV
Not listed

Published

June 5, 2026

Last Modified

June 5, 2026

Advisory Details (3)

Auto-updated Jun 5, 2026
Patch available. Sources: github_release.
generic

Markdown Preview Enhanced Arbitrary Code Execution via WaveDrom eval() | Advisories | VulnCheck

https://www.vulncheck.com/advisories/markdown-preview-enhanced-arbitrary-code-execution-via-wavedrom-eval
github_release Patch Available

0.8.28

Patch available: shd101wyy/vscode-markdown-preview-enhanced 0.8.28

https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.28
generic

[BUG] [Security Vulnerability] Arbitrary File Write via WaveDrom eval() Code Injection in Markdown Preview Enhanced · Issue #2315 · shd101wyy/vscode-markdown-preview-enhanced · GitHub

https://github.com/shd101wyy/vscode-markdown-preview-enhanced/issues/2315

Vendor Advisories for CVE-2026-50733(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 10× in last 7d / 74× 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 131 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-50733?
CVE-2026-50733 is a high vulnerability published on June 5, 2026. Markdown Preview Enhanced before 0.8.28 parses WaveDrom diagrams by evaluating untrusted markdown content with eval(), allowing arbitrary JavaScript execution. The flaw affects every render path - the live preview (window.eval) and presentation mode plus HTML export (the bundled…
When was CVE-2026-50733 disclosed?
CVE-2026-50733 was first published in the National Vulnerability Database on June 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-50733 actively exploited?
CVE-2026-50733 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 28.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-50733?
CVE-2026-50733 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-50733?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50733, 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.

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