Blocksy Companion <= 2.1.19 — Authenticated (Author+) Arbitrary File Upload via SVG Upload Bypass
CVE-2025-12846Published · Updated Action summary
Affected: ≤2.1.19Update to 2.1.20 or newer
All remediation steps- Severity
- High8.8
- CVSS
- 8.8CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:LPrivileges required- Low
UI:NUser interaction- None
S:UScope- Unchanged
C:HConfidentiality- High
I:HIntegrity- High
A:HAvailability- High
- Weakness
- CWE-434 Arbitrary File Upload
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Blocksy Companion blocksy-companion
- Affected≤ 2.1.19
- Patched in2.1.20
Update to 2.1.20 or newer.
You are affected if you run ≤ 2.1.19. Version 2.1.20 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Blocksy Companion.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 2.1.20, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Blocksy Companion to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to shark3y.
The Blocksy Companion plugin for WordPress is vulnerable to authenticated arbitrary file upload in all versions up to, and including, 2.1.19. This is due to insufficient file type validation detecting SVG files, allowing double extension files to bypass sanitization while being accepted as a valid SVG file. This makes it possible for authenticated attackers, with author level access and above, to upload arbitrary files on the affected site's server which may make remote code execution possible.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Blocksy Companion
All 16| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting ≤2.1.60Update to 2.1.61 | CVE-2026-65444 | |
| Critical9.1 | Unauthenticated Privilege Escalation to 'role' Parameter ≤2.1.58Update to 2.1.59 | CVE-2026-107645 | |
| Medium5.3 | Missing Authorization ≤2.1.55Update to 2.1.56 | CVE-2026-97247 | |
| Medium6.4 | Authenticated (Author+) Stored Cross-Site Scripting via 'tagName' Block Attribute (blocksy/dynamic-data) ≤2.1.51Update to 2.1.52 | CVE-2026-18488 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via 'blc-review-images[]' Parameter ≤2.1.46Update to 2.1.47 | CVE-2026-15158 |
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤2.1.60Update to 2.1.61
- Critical9.1Unauthenticated Privilege Escalation to 'role' Parameter
≤2.1.58Update to 2.1.59
- Medium5.3Missing Authorization
≤2.1.55Update to 2.1.56
- Medium6.4Authenticated (Author+) Stored Cross-Site Scripting via 'tagName' Block Attribute (blocksy/dynamic-data)
≤2.1.51Update to 2.1.52
- Critical9.8Unauthenticated Arbitrary File Upload via 'blc-review-images[]' Parameter
≤2.1.46Update to 2.1.47
Same weakness (Arbitrary File Upload)
All Arbitrary File Upload| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity high, CVSS 8.8
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- [object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.