CVE-2026-58480 json
Blocksy Companion Pro < 2.1.47 Unauthenticated File Upload via save_attachments
published 2026-07-08 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-42233
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.6%
- EPSS 3.6% chance of exploitation in 30 days, percentile 89%
- public exploits
- 1
- Exploit-DB
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.
Patch / fix
Timeline
- Published
- First public exploit (EDB-52640)
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 4 mo ago
Exploit prediction
3.57% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- EDB-52640 Blocksy Companion 2.1.46 - RCE webapps, 2026-08-11
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.2 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 9.2 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Creative Themes Blocksy Companion
Classification
- Weakness
-
- CWE-434 Unrestricted Upload of File with Dangerous Type
- Technology feeds
References
-
wordpress.org
/plugins/blocksy-companion/
product, patch
-
wordfence.com
/threat-intel/vulnerabilities/wordpress-plugins/blocksy-companion/blocksy-companion-2146-unauthenticated-arbit
third-party-advisory
-
patchstack.com
/database/wordpress/plugin/blocksy-companion/vulnerability/wordpress-blocksy-companion-plugin-2-1-46-unauthent
third-party-advisory
-
vulncheck.com
/advisories/blocksy-companion-pro-unauthenticated-file-upload-via-save-attachments
third-party-advisory
Sources
- CVE List CVE-2026-58480
- NVD CVE-2026-58480
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.