CVE-2026-58480

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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: the CNA's CVSS, EPSS, GitHub Security Advisory
Trending — 3 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 3.6%CVSS: 9.8Exploit: Public PoCExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

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
9.8CRITICALmedium confidence
EG Risk
75
EG Risk 75/100

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 (value × EchelonGraph’s weight)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
3.6%
EPSS %ILE
89th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 8, 2026

Last Modified

July 14, 2026

Advisory Details (3)

Auto-updated Oct 11, 2026
Fix referenced — no release confirmed yet.
Web page

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
Web page

Blocksy Companion – WordPress plugin | WordPress.org

https://wordpress.org/plugins/blocksy-companion/
Web page

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 14× in last 7d / 44× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 388 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 288 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 3.6% · 89th percentile
  2. 2026-10-13 08:40 UTCEG score recompute
  3. 2026-10-13 08:40 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 3.6% · 89th percentile
  5. 2026-10-12 15:53 UTCEG score recompute
  6. 2026-10-12 06:40 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-10-11 19:36 UTCEG score recompute
  8. 2026-10-11 16:52 UTCEG score recompute
  9. 2026-10-11 14:14 UTCEG score recompute
  10. 2026-10-11 13:49 UTCEPSS rescoreEPSS 3.6% · 89th percentile
  11. 2026-10-10 20:00 UTCEPSS rescoreEPSS 3.6% · 89th percentile
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 3.6% · 89th percentile
  13. 2026-10-08 17:13 UTCEPSS rescoreEPSS 3.6% · 89th percentile
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 3.6% · 89th percentile
  15. 2026-10-06 15:18 UTCEPSS rescoreEPSS 3.6% · 89th percentile
  16. 2026-10-05 17:43 UTCEPSS rescoreEPSS 3.6% · 89th percentile
  17. 2026-10-03 14:26 UTCEPSS rescoreEPSS 3.6% · 89th percentile
  18. 2026-10-02 17:56 UTCEPSS rescoreEPSS 3.6% · 89th percentile
  19. 2026-10-01 19:50 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  20. 2026-10-01 16:20 UTCEG score recompute
  21. 2026-10-01 16:20 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-09-30 15:03 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  23. 2026-09-29 15:22 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  24. 2026-09-28 13:51 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  25. 2026-09-28 13:26 UTCEG score recompute
Show 75 more
  1. 2026-09-28 13:26 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  2. 2026-09-27 13:48 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  3. 2026-09-26 15:59 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  4. 2026-09-24 14:04 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  5. 2026-09-24 11:53 UTCEG score recompute
  6. 2026-09-24 11:53 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-09-23 17:54 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  8. 2026-09-23 10:59 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  9. 2026-09-23 06:13 UTCEG score recompute
  10. 2026-09-23 06:13 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-09-18 19:28 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  12. 2026-09-18 10:10 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  13. 2026-09-18 05:46 UTCEG score recompute
  14. 2026-09-18 05:46 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  15. 2026-09-17 19:31 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  16. 2026-09-16 14:08 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  17. 2026-09-16 05:15 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  18. 2026-09-15 03:11 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  19. 2026-09-14 08:32 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  20. 2026-09-14 04:11 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  21. 2026-09-13 23:51 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-09-13 17:28 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  23. 2026-09-13 12:47 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  24. 2026-09-13 08:26 UTCEG score recompute
  25. 2026-09-13 08:26 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  26. 2026-09-12 13:35 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  27. 2026-09-12 03:38 UTCEG score recompute
  28. 2026-09-12 03:38 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  29. 2026-09-11 14:53 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  30. 2026-09-10 09:35 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  31. 2026-09-08 22:01 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  32. 2026-09-07 16:01 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  33. 2026-09-06 14:05 UTCEG score recompute
  34. 2026-09-06 14:05 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  35. 2026-09-06 13:47 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  36. 2026-09-06 04:35 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  37. 2026-09-05 22:50 UTCEG score recompute
  38. 2026-09-05 22:50 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  39. 2026-09-04 05:07 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  40. 2026-09-02 14:12 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  41. 2026-09-01 13:54 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  42. 2026-09-01 04:40 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  43. 2026-08-31 02:11 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  44. 2026-08-30 21:50 UTCEG score recompute
  45. 2026-08-30 21:50 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  46. 2026-08-30 19:17 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  47. 2026-08-30 17:22 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  48. 2026-08-30 13:01 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  49. 2026-08-30 07:38 UTCEG score recompute
  50. 2026-08-30 07:38 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  51. 2026-08-30 01:22 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  52. 2026-08-28 21:42 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  53. 2026-08-28 02:43 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  54. 2026-08-27 21:51 UTCEG score recompute
  55. 2026-08-27 21:51 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  56. 2026-08-27 14:25 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  57. 2026-08-27 01:43 UTCEG score recompute
  58. 2026-08-27 01:43 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  59. 2026-08-26 14:46 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  60. 2026-08-26 12:56 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  61. 2026-08-26 08:29 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  62. 2026-08-25 14:49 UTCEG score recompute
  63. 2026-08-25 14:49 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  64. 2026-08-25 13:49 UTCEPSS rescoreEPSS 3.6% · 88th percentile
  65. 2026-08-25 10:15 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  66. 2026-08-25 05:15 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  67. 2026-08-25 00:55 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  68. 2026-08-24 20:35 UTCEG score recompute
  69. 2026-08-24 20:35 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  70. 2026-08-24 14:12 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  71. 2026-08-24 09:44 UTCEG score recompute
  72. 2026-08-24 09:44 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  73. 2026-08-24 04:39 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  74. 2026-08-24 00:18 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8
  75. 2026-08-23 19:58 UTCGHSA enrichmentGHSA-r58f-77hp-phcj · GitHub severity CRITICAL · GitHub CVSS 9.8

Publicly available exploits

(2 references)

Public exploit code is referenced for this CVE (1 Exploit-DB entry, 1 GitHub PoC). No release with the fix is confirmed, so defenders should restrict or isolate affected systems accordingly until one is applied.

  • Exploit-DBEDB-52640
    Published Aug 11, 2026

    Blocksy Companion 2.1.46 - RCE

    Open source ↗
  • GitHub PoCshinthink/CVE-2026-58480
    Published 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-severity vulnerability; its CVE record was 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 made public?
CVE-2026-58480 was made public on July 1, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on July 8, 2026. EchelonGraph's copy of the record carries a last-modified date of July 14, 2026; the record at its source may have been updated since.
Is CVE-2026-58480 actively exploited?
CVE-2026-58480 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.6% probability of exploitation in the next 30 days (89th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-58480?
CVE-2026-58480 has a CVSS base score of 9.8 (the CNA's own assessment, by vulncheck; NVD's own analysis pending).
How do I remediate CVE-2026-58480?
A fix for CVE-2026-58480 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation. The vendor advisories EchelonGraph has for CVE-2026-58480 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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