CVE-2026-58480

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-08. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, 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: 4%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

Blocksy Companion Pro plugin for WordPress before 2.1.47 contains an unauthenticated arbitrary file upload vulnerability that allows attackers to upload executable files by bypassing extension validation in the save_attachments function exposed through the Advanced Reviews feature. Attackers can exploit the Custom Fonts extension's flawed strpos() substring check by uploading double-extension filenames such as shell.woff2.php, causing the validation to pass on the substring match while the web server executes the file as PHP, achieving remote code execution.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Track)
EG Risk 75/100SSVC: 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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
4%
EPSS %ILE
89%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 14, 2026

Advisory Details (3)

Auto-updated Aug 29, 2026
No patch confirmed yet.
generic

Blocksy Companion Pro < 2.1.47 Unauthenticated File Upload via save_attachments | Advisories | VulnCheck

https://www.vulncheck.com/advisories/blocksy-companion-pro-unauthenticated-file-upload-via-save-attachments
generic

Blocksy Companion – WordPress plugin | WordPress.org

https://wordpress.org/plugins/blocksy-companion/
generic

Arbitrary File Upload in WordPress Blocksy Companion Plugin - Patchstack

https://patchstack.com/database/wordpress/plugin/blocksy-companion/vulnerability/wordpress-blocksy-companion-plugin-2-1-46-unauthenticated-arbitrary-file-upload-vulnerability

Vendor Advisories for CVE-2026-58480(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 30× in last 7d / 194× 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 312 total refreshes for this CVE.

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

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 GitHub PoC) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-52640
    First seen Aug 11, 2026

    Blocksy Companion 2.1.46 - RCE

    Open source ↗
  • GitHub PoCshinthink/CVE-2026-58480
    First seen Jul 26, 2026

    CVE-2026-58480 / CVE-2026-15158 — Unauthenticated RCE in Blocksy Companion Pro < 2.1.47 (300K+ installs). Pre-auth arbitrary file upload via double-extension bypass.

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-58480?
CVE-2026-58480 is a critical vulnerability published on July 8, 2026. Blocksy Companion Pro plugin for WordPress before 2.1.47 contains an unauthenticated arbitrary file upload vulnerability that allows attackers to upload executable files by bypassing extension validation in the save_attachments function exposed through the Advanced Reviews feature. Attackers can…
When was CVE-2026-58480 disclosed?
CVE-2026-58480 was first published in the National Vulnerability Database on July 8, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58480 actively exploited?
CVE-2026-58480 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4% probability of exploitation in the next 30 days, which ranks it in the top 11.4% of all scored CVEs.
What is the CVSS score of CVE-2026-58480?
CVE-2026-58480 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-58480?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58480, 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

Explore the affected products and dependency analysis for CVE-2026-58480

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