Hash Form permits unauthenticated arbitrary file upload
Hash Form through 1.4.2 allows an unauthenticated attacker to upload a dangerous file to the site. Attacker-controlled executable content can lead to arbitrary code execution and full site compromise.
- Component
- Hash Form
- Plugin slug
hash-form- Affected
- n/a through 1.4.2
- Safe version
1.4.3- Published
- Aug 31, 2026
This CVE was published Aug 31, 2026 and is one of 8 known issues for this plugin.
Update, patch or deactivate.
Update Hash Form to 1.4.3 or later and inspect uploads, WordPress files, accounts and administrator activity for signs of compromise.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
Unauthenticated Arbitrary File Upload in Hash Form <= 1.4.2 versions.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H