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TI-2026-42084 Aliases CVE-2026-58480GHSA-r58f-77hp-phcj

Blocksy Companion Pro < 2.1.47 Unauthenticated File Upload via save_attachments

Priority MEDIUM 54CWE-434Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-434.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.03572 89th percentileScored 2026-11-07
Fix Fixed Blocksy Companion (Creative Themes): 2.1.47

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
creativethemeshqBlocksy Companionup to 2.1.462.1.47Patch availableCNA
  • Blocksy Companion Vendorcreativethemeshq Affected up to 2.1.46 Fixed in 2.1.47 Patch available CNA

Remediation

  • Fix · CNA Blocksy Companion (Creative Themes) Fixed in 2.1.47

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-58480
  2. 2026-10-03 Alias added: GHSA-r58f-77hp-phcj

References

Patch 1

Advisory 2

  • TI-2023-01796 Blocksy Companion < 1.8.82 - Subscriber+ Draft Post Access CVSS 3.1MEDIUM 4.3
  • TI-2026-12769 Blocksy Companion <= 2.1.46 - Unauthenticated Arbitrary File Upload via 'blc-review-images[]' Parameter CVSS 3.1CRITICAL 9.8
  • TI-2026-41450 WordPress Blocksy Companion Pro plugin <= 2.1.46 - Remote Code Execution (RCE) vulnerability CVSS 3.1CRITICAL 10.0
  • TI-2026-70281 Unauthenticated privilege escalation in Blocksy Companion CVSS 3.1CRITICAL 9.1
  • TI-2026-28570 WordPress Blocksy Companion Pro plugin < 2.1.29 - SQL Injection vulnerability CVSS 3.1CRITICAL 9.3
  • TI-2026-29451 WordPress Blocksy Companion Pro plugin <= 2.1.37 - Remote Code Execution (RCE) vulnerability CVSS 3.1CRITICAL 9.9
See all 35 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences