CVE-2026-87796 json
Multi Uploader for Gravity Forms <= 1.1.9 - Unauthenticated Arbitrary File Upload via Chunked File Upload
published 2026-09-17 53 d ago modified 2026-09-19 51 d ago also EUVD-2026-81335
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 66%
- public exploits
- 0
- none known
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.
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 51 d ago
Exploit prediction
1.14% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 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
- sh1zen Multi Uploader for Gravity Forms
Classification
- Weakness
-
- CWE-434 Unrestricted Upload of File with Dangerous Type
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/47337bc1-fa3d-470c-9524-859295261017?source=cve
- plugins.trac.wordpress.org /browser/gf-multi-uploader/tags/1.1.9/inc/GFMU_FileUploader.php#L560
- plugins.trac.wordpress.org /browser/gf-multi-uploader/tags/1.1.9/inc/GFMU_FileUploader.php#L319
- plugins.trac.wordpress.org /browser/gf-multi-uploader/tags/1.1.9/inc/GFMU_FileUploader.php#L322
- plugins.trac.wordpress.org /browser/gf-multi-uploader/tags/1.1.9/inc/GFMUHandlePluploader.class.php#L257
- plugins.trac.wordpress.org /browser/gf-multi-uploader/tags/1.1.9/GFMUAddon.class.php#L125
Sources
- CVE List CVE-2026-87796
- NVD CVE-2026-87796
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.