CVE-2026-50873

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-15. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0

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

An arbitrary file upload vulnerability in the attachment handling component of flatnotes v5.5.4 allows attackers to execute arbitrary code via uploading a crafted HTML or SVG file.

CVSS v3
9.8
EG Score
9.8(high)
EPSS
35.4%
KEV
Not listed

Published

June 15, 2026

Last Modified

June 16, 2026

Advisory Details (1)

Auto-updated Jun 20, 2026
No patch confirmed yet.
generic

Reference for CVE-2026-50873 · GitHub

https://gist.github.com/pyuysig/ab0af5b10877fb906941e05a69b202a7

Vendor Advisories for CVE-2026-50873(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 66× in last 7d / 212× 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 212 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-50873?
CVE-2026-50873 is a critical vulnerability published on June 15, 2026. An arbitrary file upload vulnerability in the attachment handling component of flatnotes v5.5.4 allows attackers to execute arbitrary code via uploading a crafted HTML or SVG file.
When was CVE-2026-50873 disclosed?
CVE-2026-50873 was first published in the National Vulnerability Database on June 15, 2026, with the most recent update on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-50873 actively exploited?
CVE-2026-50873 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 35.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-50873?
CVE-2026-50873 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-50873?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50873, 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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