Security readout for executives and security teams
Plain-English summary
CVE-2025-23921 is a critical arbitrary file upload flaw in the WordPress Multi Uploader for Gravity Forms plugin. The source says vulnerable versions through 1.1.3 may allow upload of dangerous file types, including web shells, which can lead to full site compromise.
Executive priority
Treat this as urgent for any exposed WordPress site using the plugin. A successful attack could let an unauthenticated attacker place a web shell and compromise the site, but available sources do not prove active exploitation.
Technical view
The issue is CWE-434: unrestricted upload of dangerous file types in sh1zen Multi Uploader for Gravity Forms, package gf-multi-uploader. CVSS 3.1 is 9.0 with network attack vector, no privileges, no user interaction, changed scope, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to WordPress sites using Multi Uploader for Gravity Forms through version 1.1.3, especially where upload functionality is reachable from the internet. The supplied affected-version metadata is sparse, so confirm installed plugin identity and version directly.
Exploitation context
The CVE description says the flaw can allow web shell upload. The source bundle does not show CISA KEV listing or other cited evidence of active exploitation, so active exploitation should not be asserted from these sources alone.
Researcher notes
The record is high impact but evidence is thin beyond the CVE and Patchstack entry. Avoid assuming exploit availability, exploitation in the wild, or a fixed version unless confirmed from vendor or Patchstack updates.
Mitigation direction
- Inventory WordPress sites for gf-multi-uploader and plugin versions through 1.1.3.
- Check vendor and Patchstack guidance for a fixed release or official mitigation.
- If no trusted fix is available, disable the plugin or affected upload workflow.
- Review upload handling controls, file type validation, and execution restrictions on upload directories.
- Prioritize internet-facing WordPress instances and high-value sites first.
Validation and detection
- Confirm whether Multi Uploader for Gravity Forms is installed and enabled.
- Record the installed version and compare it with the reported affected range through 1.1.3.
- Review web server logs for suspicious uploads or unexpected executable files.
- Inspect upload directories for unauthorized scripts without executing them.
- Verify remediation against vendor or Patchstack guidance after changes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-434: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-23921 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H2.26PatchstackVulnerability scoring details
Base CVSS 3.1 score
9CriticalVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Unrestricted Upload of File with Dangerous Type
Unrestricted Upload of File with Dangerous Type represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.