CVE-2026-50873

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM 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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: Elevated riskExposed: 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(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

June 15, 2026

Last Modified

June 16, 2026

Advisory Details (1)

Auto-updated Aug 26, 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 13× in last 7d / 149× 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 367 total refreshes for this CVE.

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

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 0% probability of exploitation in the next 30 days, which ranks it in the top 63.4% of all scored CVEs.
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.

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