Multi Uploader for Gravity Forms <= 1.1.9 - Unauthenticated Arbitrary File Upload via Chunked File Upload
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 Multi Uploader for Gravity Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.1.9 via the move_file function. This is due to insufficient file type validation during chunked upload handling. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.
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
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-87796
- 2026-10-03 Alias added: GHSA-h7vp-g8q2-89c8
References
Other 6
- https://www.wordfence.com/threat-intel/vulnerabilities/id/47337bc1-fa3d-470c-9524-859295261017?source=cve
- https://plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9/inc/GFMU_FileUploader.php#L560
- https://plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9/inc/GFMU_FileUploader.php#L319
- https://plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9/inc/GFMU_FileUploader.php#L322
- https://plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9/inc/GFMUHandlePluploader.class.php#L257
- https://plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9/GFMUAddon.class.php#L125
More sh1zen vulnerabilities
- TI-2025-13105 Multi Uploader for Gravity Forms <= 1.1.7 - Unauthenticated Arbitrary File Deletion CVSS 3.1CRITICAL 9.8
- TI-2026-04892 Multi Uploader for Gravity Forms <= 1.1.8 - Missing Authorization to Unauthenticated Arbitrary Media Deletion CVSS 3.1CRITICAL 9.1
- TI-2025-33281 WordPress WP Optimizer plugin <= 2.5.0 - Cross Site Request Forgery (CSRF) vulnerability CVSS 3.1CRITICAL 9.6
- TI-2025-17688 WordPress Multi Uploader for Gravity Forms plugin <= 1.1.3 - Arbitrary File Upload vulnerability CVSS 3.1CRITICAL 9.0
- TI-2026-05519 WP Optimizer <= 2.5.0 - Authenticated (Administrator+) SQL Injection via 's' Parameter CVSS 3.1MEDIUM 4.9
Sources
- CVE-2026-87796 · CVE Program
- CVE-2026-87796 · NVD
- FIRST EPSS
- GHSA-h7vp-g8q2-89c8 · GitHub Advisory Database · CC BY 4.0
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