Blocksy Companion <= 2.1.46 - Unauthenticated Arbitrary File Upload via 'blc-review-images[]' Parameter
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-434.
Summary
The Blocksy Companion plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.1.46 via the save_attachments function. This is due to the Custom Fonts extension registering a wp_check_filetype_and_ext filter that approves any filename containing .woff2 or .ttf as a substring via strpos() rather than validating that those strings appear as the final extension via PATHINFO_EXTENSION — allowing double-extension filenames such as shell.woff2.php to pass MIME validation and be handled as permitted font files. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. This vulnerability is only exploitable when the premium version of the plugin (blocksy-companion-pro) is installed with both the WooCommerce Extra (Advanced Reviews) and Custom Fonts extensions active; the free blocksy-companion plugin does not contain the vulnerable code paths.
Why it matters now
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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| creativethemeshq | Blocksy Companion | up to 2.1.46 | — | No fix listed | CNA |
- Blocksy Companion Vendorcreativethemeshq Affected up to 2.1.46 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-15158
- 2026-10-03 Alias added: GHSA-hhjp-58g7-3jr8
References
Other 3
- https://www.wordfence.com/threat-intel/vulnerabilities/id/2df449b4-3f3b-4afc-b391-8d8d11710c07?source=cve
- https://plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.46/framework/premium/extensions/woocommerce-extra/features/advanced-reviews/feature.php#L811
- https://plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.46/framework/premium/extensions/custom-fonts/extension.php#L137
More creativethemeshq vulnerabilities
- TI-2026-42084 Blocksy Companion Pro < 2.1.47 Unauthenticated File Upload via save_attachments CVSS 4.0CRITICAL 9.2
- TI-2023-01796 Blocksy Companion < 1.8.82 - Subscriber+ Draft Post Access CVSS 3.1MEDIUM 4.3
- 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
Sources
- CVE-2026-15158 · CVE Program
- CVE-2026-15158 · NVD
- FIRST EPSS
- GHSA-hhjp-58g7-3jr8 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences